Best AR-15 Build Kits – 2020 Complete Buyer’s Guide

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The AR-15 has been very popular with all kinds of shooters ever since its introduction, partly thanks to the adoption of the M16 by the U.S. military and partly due to the modular design, which allows you to swap parts and customize your weapon to your heart’s desire.

While the AR-15 platform is reliable and accurate, you will enjoy the ability to mold your gun for the purpose you need, such as plinking, hunting, target shooting, or self-defense.

In this article we will look at building your AR-15 from a kit. Building your own will help you know the gun more intimately and highlight any future upgrades you want to make. Read on to learn more about the parts of the AR-15 and what to look for in a build kit.

Comparison of the Best AR-15 Build Kits

IMAGEPRODUCT
  • Basic lower parts kit with all minor components
  • Compatible with all standard AR-15 lowers
  • Affordable and delivers good value for money
View Latest Price →Read Customer Reviews
  • Runner-up AR-15 build kit
  • Complete build kit with all components including stock and barrel
  • Easy to assemble and allows customization
View Latest Price →Read Customer Reviews

Some Assembly Required

Building an AR-15 is actually not too difficult. The hardest part is usually trying to get the tiny springs into place without them bouncing all around the garage. Not a lot of tools are needed and most pieces are simply attached with pins. For a true enthusiast, building from a kit is a fun way to take the next step in the field.

Let’s have a look at some of the pieces involved. A build kit may include some or all of these and even more depending on the type of kit and the manufacturer. Looking at these factors will help you understand whether it’s the right kit for you. If not, you’ll want to make substitutions or just buy each piece individually.

How to Choose an AR-15 Build Kit

Building an AR-15 from scratch can be a challenge. It will also take a certain build kit to make sure the project is complete from start to finish.

Instead of shelling out money for individual components from various brands, you can buy a build kit for a lot less, saving time and effort in tracking down the individual parts instead of buying them separately.

Buying a build kit doesn’t allow the same level of customization as buying every individual part separately, but it allows you to experience the thrill of building your own AR-15. It also allows more customization than you’d get just buying a rifle off the shelf, so it kind of falls into a nice middle ground.

Not every kit is created equal. Here are a few things to look for while selecting a build kit of your choice:

Price

You can find a build kit that is affordable for your budget in terms of quality and performance. It’s important that you find the best you can afford, rather than try to save a few dollars and sacrifice quality in the process. Whether you’re on a budget or have money to play around with, you’re bound to find a build kit you’ll enjoy using.

Does it Have All the Parts You Need?

Not every AR-15 build kit will have all the parts you need to completely build out a rifle, so it’s important to know which parts are available when you receive the kit. Having as many parts as possible will lessen the amount of time your project will take. It will also allow you to save time and money trying to track down all the other parts you need individually. 

Ease of Installation

If you lack gunsmithing skills, know that you’re not alone in this regard. These build kits will ensure that your build will be easy from start to finish. Every part that you’ll have handy will be easy to install and will not require a ridiculous amount of gunsmithing skills. Find a kit that includes parts that are easy to install piece-by-piece.

Quick Take - The Best AR-15 Build Kits

These are our recommendations for the best build kits for the AR-15:

  1. CMMG AR-15 Lower Gunbuilder's Parts Kit
  2. DPMS AR-15 5.56 16" Oracle Rifle Kit

Review of the Best AR-15 Build Kits

The following is a list of the six best AR-15 build kits currently on the market. As you look through each one, you should note the features and characteristics so you know which parts are included in a certain kit. Your job is to find the best kit you can find that contains all the parts you need.

Each one varies as to what it includes, so be sure to check closely into the kit you are considering. Let’s take a look at the first AR-15 build kit on our list:

Pros

  • No fitting needed
  • All parts are easy to install
  • Most parts fit a stripped lower quite nicely
  • Functions properly once everything is installed
  • High-quality components
  • Compatible with all lowers
  • Precise packaging and labeling of components

Cons

  • Doesn’t include trigger, trigger grip, or trigger guard

What Recent Buyers Report

New buyers were pretty happy with the build kit. They were able to fit this on most stripped lower receivers. One user said he had all the parts he needed to make his AR-15 build fully functional and ready to go once the building project was complete. He also added that he would get a kit like this again for future AR-15 builds.

Why it Stands Out to Us 

This kit has all the parts to make a lower receiver function. This includes the firing group and the trigger group. They are important to the AR-15 rifle. Because without them, the rifle will obviously be rendered useless. Each part is made from high-quality materials and is guaranteed to last you quite a while. So if you want high-quality, fully functioning parts right out of the box, this kit will never disappoint you.

This kit from CMMG is specifically aimed towards building the lower of your AR-15 rifle. The lower parts kit includes a takedown pin, pin detent and spring (2 each), hammer, trigger pin (2), safety selector, magazine catch and release, bolt catch and plunger, buffer retainer, and all the other required pins and springs. In short, this lower parts kit is a all-in-one solution for building your lower receiver.

The kit is helpful for building a customized lower, especially with a custom grip and trigger group. The finish of all the parts in this kit is very consistent and the parts have been machined to fit well. Every component in the package is separately packed and clearly labeled so you can keep things organized during installation.

All parts of the kit have a matte black finish so they blend really well with the aesthetics of your rifle. All the parts in the kit are mil-spec and compatible with all lowers, so you don’t have to worry about selecting a specific type for your lower. Finally, the kit has been priced so well, you may end up buying an extra as a backup.

Who Would Use This Most?

This kit will certainly be a must-use for those building their AR-15 rifles from scratch. In fact, this should be one of the first build kits you should get. That’s because a lower receiver kit will contain some of the most vital parts of an AR-15. It’s a must-have if you need something like a good trigger or firing assembly.

Bottom Line

The CMMG AR-15 Lower Gunbuilding Lower Parts Kit will certainly stand out as a must-have kit for the AR-15 builder. If you want something that will give you long-lasting parts that will function as a unit once you install each and every one, this build kit should be high at the top your list of must-haves. 

The Lower Parts Kit from CMMG is an inexpensive and complete solution to build your AR-15. The kit is compatible with all lowers, which is another attractive feature. This means you can also keep one as a backup for replacing worn out parts.

Pros

  • Parts are durable and high in quality
  • Easy to install, great for first-time builders
  • Most parts fit their assigned receivers (upper/lower)
  • Compatible with 5.56 NATO chambered AR-15 rifles
  • Picatinny rail included, which allows for additional customization for scopes, optics, etc.

Cons

  • None

What Recent Buyers Report

A lot of new buyers were pretty impressed with the kit. They were quick to point out that this contained so many needed parts for their AR-15 building project. One user said he was able to use every part to his advantage and was able to knock out a huge majority of his building project with this kit alone. He added that the top rail in the kit actually fit his favorite AR-15 rifle scope.

Why it Stands Out to Us 

This kit pretty much has it all, parts for your lower receiver, upper receiver, and everything in-between. So this kit pretty much gives you what you need in order for the building project to go quite smoothly. Every single part is made from the highest quality materials. For example, the pistol grip is made from polymer, which is designed to give you excellent grip and control over your rifle in even the most adverse weather conditions.

Recently, DPMS released its well-planned AR-15 build kit chambered in 5.56 NATO. It is intended for both first-time buyers and more experienced shooters.

The Oracle kit includes everything except a stripped lower receiver, sights, and a magazine. The A3-type, flat-top upper receiver built from 7075 T6 aluminum comes with the ejection port cover and is forward-assist installed. The upper includes Glacier Guard handguards, which are generally regarded as sufficiently heat-resistant. It also includes a standard BCG and charging handle assembled at the factory.

This affordable kit features a  16” Lite-contour barrel made of 4140 chrome moly steel and is topped with an A2-style flash hider. The light "pencil profile" barrel has a 1:9 rifling twist rate. M4 feed ramps ensure reliable feeding of both commercial and surplus ammunition. The unit has a carbine-length gas system with a single-rail Picatinny rail gas block.

The Oracle Rifle Kit sports a proprietary Pardus collapsible buttstock assembly with a commercial diameter buffer tube, carbine buffer, and all necessary components to complete the construction of this introductory carbine.

Who Will Use This Most 

This will definitely be a kit worth using by most amateur AR-15 builders. In fact, this would be a great build kit for the first time builder. Since you pretty much have all the parts there, it saves them a lot of time trying to figure out which parts they need in order to make the build complete. If you want a build kit that has all the basic parts you need and then some, you’d be hard-pressed to find a kit like this anywhere else.

Bottom Line

The DPMS Kit has every single part that is vital to the AR-15's functionality. Be sure to add on each part little by little as you go along. By the time you’re finished, you’ll have an AR-15 that is ready for a few test fires at the range. Once you get some successful shots off, then it’s off on the next hunting or target shooting adventure.

Pros

  • All made from durable materials
  • Perfect for a mil-spec AR-15 rifle build
  • Parts functions properly after install
  • Includes all the parts you need for your lower receiver
  • Most of them are easy to install and take only a few minutes

Cons

  • Some report missing pins and springs
  • The safety selector may have some issues
  • A few have reported some grittiness and hang-ups on the trigger assembly

What Recent Buyers Report

New buyers were able to fit these parts on their lower receivers without any issues or permanent alterations to their rifles. While a majority of them have used this as part of their AR-15 building project, others have used this as an upgrade kit to better improve their lower receiver. Overall, the parts function properly and everything was smooth and put together. 

Why it Stands Out to Us 

This kit contains all your small parts, like your pins and springs. These include parts like your buffer tube, trigger assembly, and your safety assembly among other parts that are essential to your AR-15 lower receiver. This is a kit that has all the parts to last you years or even decades. So long as you take great care of your rifle, there is no question of how long your newly built or upgraded AR-15 will last.

The Geissele AR-15 Lower Part Set assumes that more-experienced builders usually upgrade their grips and triggers first. In that context, Geissele LPK includes all parts except the fire control group and pistol grip.

Unlike some kits that offer Metal Injection Molded (MIM) parts, these quality AR-15 lower components are made from hardened stainless steel or by casting process that meets or exceeds military specifications (Mil-Spec).

The Geissele AR-15 Lower Parts Kit consists of the bolt catch, bolt catch plunger, spring and roll pin, mag release, mag release button and spring, buffer retainer and spring, safety, safety detent and spring, trigger guard and roll pin, takedown detents and springs, and pivot and takedown pins.

With 17 parts, this slightly-expanded basic set is an extremely customizable AR-15 gun build kit. It only provides what you need without the extra parts you're going to replace anyway.

Who Will Use This Most

If you’re either a builder or looking for a great upgrade kit, this will probably be something that’s right up your alley. No matter what you use the kit for, you’ll have a lower receiver that has fully functioning parts that will work like a well-oiled machine. You’ll be firing off your shots a lot smoother than before (assuming you’re upgrading). 

Bottom Line

The Geissele Automatics LLC AR-15 Lower Parts Kit might be what you need if you’re looking to add on the lower receiver to your AR-15 build or if you’re simply in need of a full-on upgrade. Once you add these parts, your AR-15 rifle will feel like it’s fresh off the assembly line and will function like it’s a brand new rifle. 

Pros

  • Parts are all easy to install
  • It can fit most AR-15 lower receivers
  • Perfect for building projects and upgrades
  • All parts are made from durable, high-quality parts
  • Includes buffer tube and adjustable stock
  • Fits all receivers

Cons

  • Some have reported missing parts
  • Trigger assembly might be a little gritty in the beginning
  • Some users don’t care for the holes on the top of the buttstock

What Recent Buyers Report

A lot of new buyers were in search of a build kit for their lower receivers. Most were using this simply for building one from scratch. Meanwhile, a good chunk of the new users were in search of a lower kit for the purpose of upgrading. All the parts were easy to install and function properly, as advertised. 

Why it Stands Out to Us 

Once again, you’re looking at a lower parts kit that will have all the parts you need to ensure that your lower receiver is fully functional. Also included is a lightweight buttstock you can add onto your rifle. This will allow for reduced recoil and will give you better control over your rifle. If you need a few good, high-quality parts to ensure your rifle is in tip-top shape after an upgrade or a complete build, this kit might be right up your alley.

This lower receiver completion kit from Brownells contains all the parts of the lower receiver assembly you’ll ever need. The kit includes all the pins, springs, buffers, and other components for completing the lower receiver, along with a trigger assembly. 

In addition to that, the kit also includes a six-position adjustable stock for your AR-15. The stock has been manufactured from nylon-based polymer and reinforced with fiberglass to deliver strength and durability to the structure. 

All the components of the kit are mil-spec and compatible with all AR-15 lowers. The buffer tube in the kit has been properly machined to match the stock interior diameter for a snug finish. The kit and stock are packed in separate pouches with proper markings to allow for easy installation. This is one of the only kits on the market which comes complete with a buffer tube and a stock. 

Additionally, the inclusion of the buffer tube and stock in the kit make it more economical and saves you a lot of money, which would otherwise be spent on buying a separate stock. The parts in the completion kit fit snugly and offer good value for the money.

Who Will Use This Most 

If you need a few good upgrades, this kit will definitely give you some of the parts you need to make it a successful one. Likewise, if you’re simply building a rifle from scratch and all you need are the best functioning parts for the lower half of your AR-15, this kit is something you should consider investing in.

Bottom Line

The Brownells AR-15 Lower Receiver Kit might be the best one to invest in if you’re looking for parts that are the closest to factory replacements. All your lower receiver parts are included and ready to be installed. Don’t be surprised that they work just as smoothly or better than your previous lower receiver parts. 

The complete lower parts kit from Brownells includes the buffer and an adjustable stock in the package, which is definitely a plus. Considering its overall price, it is a good bargain with the inclusion of those extra items. Plus, it is compatible with all AR platforms. 

Pros

  • Super-durable parts
  • Fit and finish are great
  • Fits most AR-15 calibers
  • It will take minutes to install each part
  • Great for building projects and upgrades
  • Quality construction 
  • Flat-top with rails
  • Compatible with all AR-15 lowers
  • Includes forward assist

Cons

  • None

What Recent Buyers Report

Most new users purchased this as part of their building project. But as expected, not a lot of other users needed an upper receiver kit for upgrading purposes. One user said he managed to add on his upper receiver with the parts included in a matter of minutes. He was impressed with the inclusion of the top rail since it allowed for additional customization for scopes and optics.

Why it Stands Out to Us 

This upper kit doesn’t give you a lot but what it does give you are vital parts for your rifle’s upper receiver. The top rail is what you’ll need for the purpose of installing your favorite scope or sight. Let’s face it, accuracy is important and you want to make the most of it with your rifle. Let’s not forget the ejection port assembly that will allow for unobstructed discarding of brass once you fire off each and every shot. 

Here comes a quality upper receiver assembly kit for your AR-15. The kit includes one stripped upper receiver forged from 7075 T6 aluminum with M4-type feed cuts on the inside for reliable feeding. The receiver includes a forward assist assembly and an ejection port assembly along with the assist push-pin and the ejection port cover.

The assembly build kit is compatible with standard and mil-spec lowers and components. For your knowledge, the kit has an aero-precision upper receiver with a precise finish and features compatibility with all lower receivers. 

The flat-top upper has rails on the top to let you mount optics with ease. The upper is aesthetically pleasing and the presence of a forward assist also helps with the overall operation of your AR-15, preventing jams and cycling issues.

The upper is easy to install and offers good value for the money. Additionally, the proper head spacing for the BCG is also an added advantage. The charging handle is mounted on the rear, so take note of that before buying. 

Who Will Use This Most 

If you need some essential parts that will fit your upper receiver, obviously this is the kit for you. Especially when you need to add on your favorite scope or optic for that accuracy boost for your rifle. Whether it’s built from scratch or in need of an upgrade, your AR-15 will have a well-deserved upgrade once you tack on this upper receiver kit.

Bottom Line

The Brownells AR-15 Tactical Upper Assembly Build Kit is the closest you can get to possibly finding the best factory replacement parts for an upper receiver. This kit contains all you'll ever need in an upper receiver build or upgrade. Why settle for less than high-quality when you can get it all in a kit like this?

The AR-15 upper from Brownells is an economical, high-quality, and complete solution for building your rifle. It fits all AR lowers and has a flat-top with rails. Plus, don’t forget the eye-catching aesthetics. 

Pros

  • Easy to install parts included
  • Fits most AR-15 lower receivers
  • Compatible with most AR-15 calibers
  • High-quality parts, can last you a really long time
  • Pistol grip provides an excellent grip, even in bad weather

Cons

  • It does not come with instructions
  • Trigger pull might be a little heavier than expected
  • Some complain that the trigger guard feels quite cheap

What Recent Buyers Report

As expected, a lot of new users were pretty impressed with what was included in the build kit. They installed every single part without a single issue each within a few minute's time. The parts were able to fit most lower receivers without issue. 

Why it Stands Out to Us 

All your large and small parts are included in one package. That’s probably what you need in a lower receiver kit, anyway. Not only that, each one is ready to install and able to do what it’s supposed to do. You’ll have a fully assembled trigger and firing assembly ready to go once you're able to put it all together. One of the best parts, of course, is the pistol grip. Made from high-quality polymer, it allows for a superior grip in any weather conditions. So if it’s nice and dry or raining cats and dogs, you have a good handle on your rifle.

Bushmaster Firearms has earned its reputation and popularity by manufacturing AR-15 style rifles. They also offer highly-regarded and affordable kits for this legendary rifle.

The Bushmaster AR-15 lower parts kit offers a carefully-selected assortment of parts with everything you need to finish your build.

However, the kit doesn't include the lower, the buffer tube, buffer, or buffer spring. The Bushmaster lower parts kit consists of an injection-molded pistol grip - a classic A2-style grip and same type of high-density polymer trigger guard. The set comes with a single-stage trigger featuring typical military or tactical rifle heavy trigger pull.

The rest of the internal parts are based on mil-spec allowing you to complete or refurbish a stripped AR-15/M16 receiver. This set of components has a uniform surface treatment with an average finish and quality.

Who Will Use This Most 

This would make a perfect lower receiver kit simply for building purposes. This may not be suitable for upgrades, since you’ll have so many parts to work with on this kit alone. So if you’re in the process of building an AR-15 rifle or are about to do so, you’d be insane to pass up the opportunity to give this kit a closer look.

Bottom Line

The Bushmaster Firearms LLC AR-15 Lower Parts Kit has everything a builder wants to build out an entire AR-15 lower receiver. Once you build out every part, you’ll have a lower that will work smoothly and provide reliable firing power like no other. 

This 5.56x45mm AR-15 receiver set with a lower parts kit and stock is made exclusively for Brownells and consists of field-proven components. The complete upper receiver comes with an M4-profile 16” barrel featuring carbine-length gas system and an A2 flash hider.  

The common A3 flat-top upper receiver is machined from forged 7075 T6 aluminum. It has 10” polymer handguards and a KeyMod rail system. The upper receiver set comes with the ejection port cover assembly and forward assist installed. The kit also includes a standard MPI-tested bolt carrier group and charging handle made of 6061-T6 billet aluminum.

A mil-spec M4-style carbine adjustable stock completes this set. The whole stock assembly is a mixture of aluminum and fiberglass-reinforced nylon. It is extremely resistant to impact. The most intricate part of this set is an 80-percent Anderson lower receiver. Of course, this calls for more-advanced armory-level gunsmithing. The mil-spec Anderson LPK (lower parts kit) includes the trigger with a hammer, a pistol grip (A2-style), and all other internals.

The Pieces You’ll Need to Put Together

The main parts of the AR-15 are related to the accuracy and reliability of your gun. The more comfortable you are with your gun, the better you will shoot with it and the more accurate it will be as a result. Being especially mindful of some of these pieces will help you build a more reliable gun.

Upper and Lower Receivers

The upper receiver or lower receiver of an AR are the central pieces of your rifle and are the keys to the AR’s modular system. Most receivers will work on any AR but buying an upper/lower pair from the same company will typically eliminate any issues in fit and finish. 

Receivers come in various finishes and looks, but popular options are polymer and aluminum. You should choose a high-quality build material to ensure your weapon will take any punishment that will occur as a result of normal use. Forged lower receivers are the most common type of lower receiver on the market, while billet receivers are less common and more expensive.

Grip

The way you hold your gun while shooting can make or break your shot. Because the grip is your personal connection to the rifle, it should feel natural in your hand, as if it’s an extension of your arm. Any discomfort you feel from the grip, whether due to protrusions, sharp edges, or the wrong size, will impact your shooting.

If your hand is large, consider changing the stock grip for a larger one that feels like it was made for you. A number of great grips are available and you can choose the grip that feels just right for you.

The typical grip for an AR-15 is the pistol grip, but in some states like California, they are prohibited. Featureless grips can help you satisfy the legal requirements in those states.

Handguard

By getting a new handguard, you not only improve the rifle’s aesthetics, but also the comfort, accuracy, and versatility of mounting accessories. The handguards come in various types, such as free-float or drop-in, and with or without rails. They can be made from a variety of materials.

Free-floating handguards not only look good, but they offer slight increases in accuracy over traditional two-piece, drop-in designs. Free-floating handguards also offer plenty of space to attach accessories via their MIL-STD-1913 rails. If you’re planning to use the AR-15 for hunting, for example, you’ll appreciate the ability to add a night vision device, extra optics, and a holographic sight.

On the other hand, drop-in handguards are much easier to install or swap out.

The most common handguard lengths are rifle, mid-length, carbine and pistol. Generally, you should match your handguard to your gas system length, but you may be able to fit a longer handguard on a shorter gas system if you use a low-profile gas block.

Barrel

The barrel affects the weight and overall performance of your rifle. A lined barrel such as chrome, Melonite, or Nitride coatings will add to the life of the barrel, extending it by over 5000 rounds fired.

Even for the more expensive ARs, over time, the accuracy of a barrel can decrease as a result of thousands of shots. The AR-15’s barrel has a lifespan of between 10,000 and 20,000 rounds, after which most show a serious loss of accuracy.

Another factor to consider is the twist rate of the barrel, as this will determine which bullet will perform best in the rifle. If you’re planning to use longer or heavier bullets, you’ll require a fast twist rate such as 1:7. For lighter bullets (55-grain or less), use a slower twist rate. For a wider range of bullets, the 1:8 or 1:9 twist rates will work fine.

Trigger

Some AR-15s come with great triggers but some don’t. The same is true for build kits. The standard mil-spec trigger sold on many AR-15 rifles works fine for some people. But when building your rifle, look carefully at what trigger is included or whether you want a new trigger to improve your accuracy and make every shot a pleasure.

You might opt for a drop-in trigger, which makes it really quick and easy to install a new trigger. A single case houses all of the trigger’s internal components, such as the trigger, sear, hammer, springs, and disconnector. Once you remove the old trigger, installing a drop-in trigger is as simple as dropping the case into the lower receiver and securing the trigger case with your trigger pins.

Charging Handle

The charging handle is used to move the striker, bolt, or hammer to the ready position, so it’s an integral part of the AR-15. Other uses include ejecting unfired rounds and spent shells, checking the gun for blockages and rounds, and releasing bolts that have rear-locked.

One reason many shooters upgrade their charging handles is that the stock handles are designed for right-handed shooters. If you’re left-handed, consider an ambidextrous charging handle that you can use with either hand.

Shooters in tactical situations love ambidextrous handles as they can be used for quick, accurate shots from either side. You can choose from a variety of materials, colors, and features for your new charging handles. Some even reduce the effect of blowback by porting gases in a different direction.

Stock

Stocks come in two main types, fixed and collapsible. While fixed stocks are sturdy and great for precision shooting, there are also many collapsible stocks that have a good-enough fit to offer both accuracy and adaptability.

In order to allow different-sized shooters to comfortably shoot your rifle, you’ll need a collapsible stock. A collapsible stock also comes in handy for shooting while wearing armor and is useful for urban fighting and crowded areas.

A folding stock will be very handy for reducing the profile of your rifle while transporting it in a bag or for storage. A folding stock will need an adapter for the AR-15, as the standard AR buffer tube/receiver extension system prevents the use of a folding stock.

Whatever stock you choose, you should match the fit to the right size of the buffer tube, whether it’s commercial or military spec.

Gas System

Most AR-15s cycle through a gas impingement system. An adjustable gas block helps to better regulate the cycling action. This lowers the felt recoil and barrel rise, as well as other annoyances as you shoot.

Some shooters might want to try out the alternative gas piston system, which has advantages and disadvantages compared to direct impingement. It’s far less common, though, so you may have trouble finding it in a build kit.

Sights

The AR platform is ideal for customizing, so it makes sense to upgrade the weapon with the best optics or sights you can afford. Optics can make a huge difference in your accuracy and allow you to see your targets precisely.

Of course, there are a ton of scopes out there, including red dots, holographic sights, and hybrid sights. Some are geared toward nighttime shooting, some have very high magnifications, and others are equipped with fancy reticles that take into account bullet drop. But your scope isn’t going to be part of a build kit.

You should know what you plan to use the gun for before investing in a scope. Holographic sights place a reticle on your target with a laser, helping you to acquire the target. They are lighter and allow a larger field of view compared to red dot sights, which use an objective lens with a partial mirror coating. Red dot sights come in both tube-body and head-up styles.

How to Build an AR-15

An AR-15 is among the simplest of rifles to assemble. Building an AR-15 doesn’t require a lot of expertise or complicated tools. If you are a bit familiar with disassembling or servicing a firearm, it will not take more than ten minutes to build an AR-15. The rifle is mainly comprised of two parts, the upper receiver and the lower receiver. All other components just fit into these two.

The best procedure is to begin with the finished lower receiver. Begin by placing the lower receiver on a vise and installing the magazine catch, followed by the bolt catch, pivot pin, safety selector, and pistol grip. Next comes the trigger assembly, which includes the trigger, hammer, and the trigger guard.

AR Components (Source)

Once that is done, install the buffer tube and take down pins. You can also dent the castle nut of the buffer tube with a punch and hammer for extra caution.

Now, move onto the upper receiver and install the ejection port cover, forward assist, barrel, gas block, and handguard, followed by the bolt assembly.

Once the lower and upper receivers have been completed, install any other accessories like mounts and suppressors. Make sure to lubricate all the parts after each step of the assembly so the rifle functions properly. In case you want a detailed manual of instructions, please refer to the video mentioned below.

Conclusion

When it comes to customizing your AR-15, keep in mind the purpose you will use it for and plan accordingly. You should try to address any comfort or ergonomic issues with the grip, trigger, and handguard by upgrading to the best-fitting accessories you can find. High-quality magazines and sights can also make a big difference in your shooting experience, as you can reload faster and more reliably with good magazines and shoot more accurately with the right scope.

Building an AR-15 from a build kit is a great way to learn more about the workings of your rifle. It also provides a high level of satisfaction through knowing you’ve done it yourself!

About Josh Lewis

Josh Lewis the managing editor at Gun Mann and when he isn't writing about guns he is more than likely tinkering with them. He also enjoys hunting, fishing and spending time outdoors. As a lifelong gun owner he knows his stuff!

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