Best AR-10 Lower Parts Kit – 2024 Top Picks Reviewed

| Last Updated:
August 23, 2023

If you’re looking for the best AR-10 Lower Parts Kit, then you’ve landed in the right place. One of the things you don’t want to do is choose a lower parts kit that will be low in quality. At the same time, you’ll want a kit that will have the parts you need.

With that in mind, we’ve taken the liberty of handpicking five of the best AR-10 lower parts kits considered the best on the market. We didn’t rush to choose these kits. We made this decision based on some of the common parts that AR-10 owners might need. We also based it on how affordable they are for those on a budget and lastly,  we considered the overall quality.

We guarantee that none of these kits will be flimsy in quality. Before we unveil the list, we’ll discuss what is inside these lower kits and help you make the distinction between a great kit versus those that are crappy in quality.

Comparison Chart of the Best AR-10 Lower Parts Kit 

  • Requires Minimal Fitting
  • Includes Springs, Pins, and Detents
  • Includes a Pistol Grip Made From High-Quality Polymer
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  • Includes Single Stage Mil-Spec Trigger
  • Includes a Grip Made From High-Quality Polymer
  • Parts Come in Easy to Identify Color-Coded Bags
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  • Best AR-10 Lower Parts Kit for the Money
  • Front and Rear Takedown Pins, Detents, and Springs
  • Includes Stock and Pistol Grip Made from High-Quality Polymer
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What’s in a Lower Parts Kit?

One thing that you’ll need to know is that not all kits are created equal. There will be some with all the parts you need. And of course, some kits won’t have those parts included. So it’s important to look through each kit carefully so you’ll be able to choose a specific kit for your AR-10. Here are some of the parts that are commonly found in AR-10 lower parts kits:

Trigger Assembly

This will house your trigger and the pins and springs that make it work. Most trigger assemblies vary in pull weight depending on which kit you choose. For example, a mil-spec trigger, on average, will have a pull weight of about four to five pounds. A good trigger is excellent to have as part of your lower assembly so you can fire off initial shots much quicker. On top of that, you will also be able to get follow up shots off much faster.

Pistol Grip and Stock

Some lower parts kits include both a pistol grip and stock. This will allow you to have full control over your rifle. As a result, you’ll be able to reduce a good amount of recoil that may cause your rifle to be slightly less accurate. Firm control will always equal better quality shots. Plus, your hit probability will certainly increase.

Magazine Catch Assembly

A lower for an AR-rifle will obviously include something to hold the magazine in place. WIthout a magazine, obviously, you won't be able to fire any additional rounds. A good magazine catch assembly will be able to hold the magazine in place and will allow for reliable cycling and feeding. The better the quality, the less likely you'll run into jamming issues while giving your AR-10 a whirl after everything is newly installed.

What Makes a Great AR-10 Lower Parts Kit?

Of course, you’ll need to know the difference between a great lower parts kit from a low-quality, crappy kit. If you’re a first-time buyer, this brief guide should help make your decision process a little easier. We’ve put this list together based on the past purchases from AR-10 rifle owners. Here’s our list of things to keep in mind when buying one of these products:


The overall quality should be your top priority when choosing a great kit. As you look closely at each kit, take note of the materials used for the parts which are included. More specifically, anything made from polymer, aluminum, or steel are considered to be of good quality. That’s because they have been proven to be the most durable material types, according to numerous gun manufacturers.


While the price is perhaps one of the top factors in a shopper’s final purchasing decision, it should also be taken with a grain of salt. In other words, if the price tag appears to be on the low end, that’s when you need to look at the overall quality of the product. Yes, there is such thing as finding something affordable in price, but also high in quality. If you’re on a budget, this is what you’ll want to aim for.


There's probably a good chance that you're an AR-10 owner that has no gunsmithing skills. If that's true, we're not judging, because we want these lower parts kits to include parts that are easy to install. The key words to look for are "drop-in". In plain English, this means easy to install.

So you're not going to need to enlist the services of a gunsmith, nor will you need any gunsmithing skills at all to install these. All you need are a few tools and minutes of your time. Once installed, your AR-10 will look like new and be ready for any kind of action.

Review of the Best AR-10 Lower Parts Kits

Below are five of the best AR-10 lower parts kits currently on the market. We encourage you to look through each of these kits carefully so you’ll know what’s inside each of them.

At the same time, you’ll easily see which materials the parts are made from to ensure that these are high-quality products. That way, if you’re looking for a kit that will last you a long time, you’ll know which one to choose.

Remember, there may be some other parts of the kit you may also need. If it’s included, then definitely consider buying it. If not, move on to the next one. With that said, let’s start with the “best overall” AR-10 lower parts kit:

Best Overall:
DPMS - 308 AR Lower Parts Kit W/ Trigger


  • Trigger Has No Creep and Pull is Also Very Smooth
  • Most of the Parts Fit Properly Without Any Additional Adjustments
  • The Grip is Solid. You Can Still Handle it in Poor Weather Conditions


  • The Front Detent May Need Some Work Prior to Fitting
  • Some of the Other Parts May Need Grinding Before Installation

First, we’ll be looking at the AR lower parts kit with a trigger from DPMS. Since this has a trigger included, obviously the entire trigger assembly will be included in this kit and pins and springs as well. Also included in the kit is a pistol grip designed to give you better hold on your AR-10 rifle.

So if you’re a shooter that holds accuracy to a high standard, it’s worth it if you get a kit that has a grip and/or a buttstock included. Either way, you’ll need both of them to ensure that you can better stabilize your AR-10 rifle.

This kit is something you’ll need if you’re either restoring an old AR-10 rifle or if you’re building a new one from the ground up. As it is, you’re getting all kinds of parts ideally found in AR-10 lowers.

Of course, no kit is complete without the pins and springs that are intended to put it all together. Coming back to the grip, it’s made from polymer, which means it's going to be a durable little unit. On top of that, this won’t be easily damaged due to weather conditions.

On top of that, you won’t have to worry about damaging this grip while cleaning your gun. No oils or solvents will harm this. If you’re looking for a good AR lower parts kit and you absolutely must have a trigger, then you’ll want to choose this kit.

Bottom Line

The kit for is great for .308 caliber AR-10 rifles. So if that’s what you have, get this kit. This has everything you’ll need to put together a complete lower. All the springs, pins, and detents are there.

Plus, the grip is an added convenience if you’re looking for one that will give you the best control possible. Don’t be surprised if you have some recoil reduction once this puppy is installed on your rifle.

CMMG - 308 AR Lower Parts Kit


  • Very Easy to Assemble and Install
  • Trigger Pull is as Close to Mil-Spec as it Gets
  • Color-Coded Bags Are an Added Convenience, Especially for First-Time Buyers


  • Some Users Have Reported Making Minor Adjustments Prior to Fitting

For our next lower parts kit, we’ll be taking a look at a .308 caliber kit from the CMMG brand. This is the kit you’ll want if you’re looking for replacement parts or new parts for your AR-10 building project.

Included is your trigger assembly, designed to give you a crisp clean pull each time you use it. The trigger itself is as close as you can get if you fancy yourself as a fan of mil-spec accessories. The grip is made from high-quality polymer that is durable and will give you the best comfort while you have full control over your AR-10 rifle.

For ease of assembly and to be clear that you know what is what, the parts included come in color-coded bags. This way, you don’t have to mix everything up. This clears up a lot of confusion and headaches.

All you want to do is install each and every part in a matter of minutes. You’d rather be at the range all day rather than trying to figure out which part is which.

All of the components in this kit are high in quality and designed to last as long as possible. If you take great care of your AR-10 rifle, then you can expect the longevity of these parts to last for years.

Bottom Line

This is a great kit to upgrade your AR-10 rifle. The parts included are all high in quality, especially the grip that’s included. This will obviously give you a better grip and better control.

If you just want to get maximum accuracy out of your AR-10 rifle, then a kit like this would be a good place to start since it has all the parts you’ll need to make the lower end complete.

Best for the Money:
PSA PA10 MOE EPT Lower Build Kit


  • Very Easy to Assemble and Install
  • Recoil Reduction is Noticeable Thanks to the Stock and Pistol Grip
  • Has Almost Every Single Part You’ll Need. Not Bad for a Budget Lower Parts Kit


  • One Review Had Complaints About the Trigger Not Being as Great in Terms of Function

For our next product, we will be looking at a PSA brand kit. This time, we’re looking at this one since we consider this to be the best AR-10 lower parts kit for those on a budget. Even if you don’t have a lot of money to play with, you’re still going to get a decent kit with all kinds of parts that will work best with your AR-10 lower.

What’s included? Let’s go down the sample list: first, you have the pistol grip and stock. These are much needed if you’re looking for parts that will allow you complete control over your AR-10 rifle. In other words, you’ll be able to resist a lot of recoil. The better you control your rifle, the more accurate your shots will be.

Of course, you’ll also have your trigger group included along with your bolt catch assembly, safety selector assembly, and much more. All you’ll ever need for your stripped AR-10 lower receiver is all right here at a price that you can afford.

It’s a whole lot better than having to spend more money on these parts separately. So if you’re looking to save money and just get all the parts in one kit, then this PSA lower build kit might be exactly what you need.

Think about it. You don’t have a lot of money to work with and a kit like this comes along with the opportunity to save you time and money. Why track down the parts you need and spend money on a part that may cost more than this kit itself?

Bottom Line

As expected, this kit has exceeded our expectations. So if you’re looking for a kit that’s affordable but has all kinds of parts that you’ll need for your AR-10, this PSA kit will be worth investing in. For a kit that won’t break the bank, this has everything that you’ll need and then some.

This is the perfect opportunity for budget shoppers to get the parts they need so they can save money and time, rather than waste it all on tracking down each individual part.

4. PSA MOE ACS-L EPT Lower Build Kit


  • Trigger Pull is Smooth and Breaks Clean
  • No Issues With the Overall Assembly and Very Easy to Install
  • May Come With Some Extra Springs and Pins. Quite Convenient in Case You Need Replacements


  • Take-Down Pins Might Be Hard to Remove

Next, we’ll be taking a look at the PSA brand’s MOE ACS-L EPT Lower Build Kit. This is one of the best AR-10 lower parts kit on the market. This kit is what we like to call the total package.

If you need a kit to complete the stripped lower half of your AR-10 rifle, then you’re obviously going to want this. Here’s what’s included: first, we have a polished trigger that comes complete with the entire assembly itself. It includes everything from the pins to the housing.

The trigger is designed to give you a crisp, clean, mil-spec style pull that will be ideal for firing off quick shots. Of course, no lower build kit is complete without a pistol grip, barrel, and a polymer-made buttstock.

If you’re looking for a kit that has all the fixin’s for your AR-10 rifle, then you’re probably going to want to give this PSA kit a try. Most of the parts are made from high-quality materials that are durable and built to last. Which is always a plus if you hold quality to a high standard.

Bottom Line

This kit is well-deserving of a place on our list. This has pretty much every conceivable part you’ll need to build a complete lower receiver. If you have an AR-10 that’s incomplete and need a lot of parts installed, you’d be insane to pass up on something like this.

It contains so many parts and can be easily installed in a matter of minutes. Add each part where it goes and be ready to go later that same day.

5. PSA PA10 Classic Lower Parts Kit


  • Easy to Assemble and Install
  • Trigger Pull is Standard. But Has No Grit to it
  • Requires No Modifications to Your AR-10 Rifle


  • Some Parts May Need to Be Filed Down Before They Can Fit
  • One Review Stated That Some of the Parts Came With Some Machining Issues
  • One Reviewer Complained That Some of the Parts Didn’t Seem Like Upgrades

Next, we’ll be sticking with the PSA brand. This is the PA10 Classic Lower Parts Kit. This kit includes plenty of parts for assembly. These include the magazine catch assembly, trigger assembly, grip assembly, and more.

You pretty much have groups and assemblies each intended for their own purpose. So you have an assembly for the firing end of your AR-10, a trigger assembly for getting your shots off quickly, and a grip assembly to allow you total control over your rifle.

So you have a standard, classic kit with all you’ll need to make sure the entire lower half of the AR-10 rifle is all set and ready for action once everything is installed.

These parts are your standard drop-in parts, which means that they are easy to install in a matter of minutes. So, if you’re looking to install parts on the lower end of your AR-10 so you can give it a go at the range as soon as possible, the PSA Classic Lower Parts Kit might be exactly what you’ll need.

Bottom Line

This is your standard lower parts kit (although it doesn’t include some of the extras like the previous PSA kit). The assemblies are all there and so are the springs, pins, and other parts.

If you’re looking for a kit that just has the usual parts that will make an AR-10 lower function properly, then this kit will obviously be the best choice.


Finding the best AR-10 lower parts kit is not that hard. If you know what kind of parts to look for, then the search will be a lot easier. Remember, no lower end of an AR-10 rifle is complete without parts like a trigger assembly, grip, stock, or whatever else.

Of course, be sure that includes all the needed springs, pins, and detents that will hold it all in one place. Find a kit that fits your rifle today and have it ready for action in a matter of minutes. 

Michael Lutes

Michael Lutes is the managing editor and owner at Gun Mann. He is a veteran, gun enthusiast, 3 gun competitor, and 2a advocate. Mike has a passion for innovation and education across the industry to create great content, training, and insights from the best and brightest.

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