AR-15 and AR-10 Interchangeable Parts – Review Guide for 2019

The AR-15 and AR-10 are both outstanding rifles built on the AR modular platform. One of the questions people often ask is whether any parts are interchangeable between the AR-10 and the AR-15. The AR-15 design inspires itself on the older AR-10, so you can swap certain parts.

In this article, we will get to know the differences and similarities between the two rifles and what parts are interchangeable. We will also share our top picks for the best interchangeable parts.

Best AR-15 and AR-10 Interchangeable Parts


Our Rating


Ergo Grips - AR-15 Suregrip Tactical Deluxe Grip

Double Star - AR-15 Socom Stock Collapsible Mil-Spec

Odin Works Inc. - AR-15 Low Profile Gas Block

Troy Industries, Inc. - AR-15 Fixed Front Battle Sight

A.R.M.S.,Inc - AR-15 40L Low Profile Rear Sight

Differences Between AR-10 and AR-15

AR-10 (Source)


AR-15 (Source)


The main difference between these guns is that the AR-15 uses the 5.56/.223 cartridge and the AR-10 uses 7.62/.308.

.223 vs .308 (Source)

Due to the heavier caliber, the lower receiver and other key components on the AR-10 are larger on the AR-15, leading to slightly heeavier weight.

With the AR-10, there is more space between the pistol grip and the edge of the lower receiver. The AR-10’s magazine walls are also larger, to accommodate the larger rounds.


The two rifles have different lengths; the AR-15 is about 3’’ shorter than the AR-10.

The AR-10 is 35.5" when collapsed and 39.5" when extended while the AR-15 is 33.3" when collapsed and 36.6" when extended.


The two rifles have a weight difference. The AR-10 weighs 8.5 lbs., being heavier than the AR-15, at 7 lbs. The heavier weight serves to withstand the forces of the heavier caliber in the AR-10.

Rifling Rate

The modern, commercially available AR-10 is chambered for the 7.62x51mm (.308 Win) and features a 16″ barrel with a right-hand twist at a rate of 1 twist per 11.25”.

Compare this to the M15TAC16, which is the ArmaLite 5.56mm (.223) tactical rifle. It also comes with a 16″ barrel but has a right-hand twist at a rate of 1 twist per 7”.

Similarities Between AR-10 and AR-15

While the two rifles have their differences, the AR-15 and the AR-10 also have a lot in common. They are built on similar frames and function in the same way.

Barrel Length

Both rifles have barrel lengths of 16 inches and are light enough to be carried around by people of any size and strength. However, barrels can be upgraded and adjusted per user.


The AR-15 employs the same “direct gas impingement” operation as the one used in the AR-10s, but comes with a few more developments as compared to its predecessor.

Rate of Fire

The AR-5 can shoot 800 rounds per minute with a muzzle velocity of 3200 FPS that attains a maximum effective range of about 600 yards.

Meanwhile, the AR-10 has an impressive cyclic fire rate of about 700 rounds per minute with a 2,772 FPS muzzle velocity.

What Parts Are Interchangeable Between the AR-15 and AR-10? 

Since the AR-10 and AR-15 are based on the same platform, they share some parts.

At the same time, the difference in calibers makes certain parts incompatible. Several manufacturers build the AR-10 and the AR-15, including Armalite, Black Rain Ordnance, Seekins Precision, etc., which leads to variations in both design and dimensions.

Amongst other parts, the upper receivers and the magazines may be incompatible and the barrel nuts from Armalite, DPMS and RRA use different thread pitches.

As a result, parts that work for one variant may not work for another.

The following parts are usually interchangeable:

  • Buttstock assemblies
  • Buttstock screw
  • Buttstock spacer
  • Triggers and trigger springs
  • Trigger guard pin
  • Trigger guard assembly (on some rifles - others have built-in trigger guards)
  • Bolt catch roll pin (Armalite Style only)
  • Bolt stop pin
  • Bolt stop plunger
  • Bolt stop spring
  • Hammers and hammer springs
  • Hammer and trigger pin
  • Pistol grips (a spacer may be needed for certain models)
  • Receiver extension (Buffer Tube)
  • Disconnector and disconnector spring
  • Magazine release buttons and springs
  • Safety selectors
  • Ejector/Safety spring
  • Safety detent
  • Detent (2 per rifle)
  • Buffer detent
  • Buffer detent spring
  • Keep in mind that some manufacturers will have variations in design and fitting, so always check with the manufacturer for compatibility before making your purchase.

    Quick Take - The Best AR-15 and AR-10 Interchangeable Parts

    These are our recommendations for the best interchangeable parts for AR-15 and AR-10:

    1. AR-15 Suregrip Tactical Deluxe Grip
    2. AR-15 Socom Stock Collapsible Mil-Spec
    3. AR-15 AAGT Geronimo Trigger System

    Our Top Picks for the Best Parts to Interchange

    There is a great variety of parts that are interchangeable between the A-10 and the AR-15, so we’ll now look at a list of our top picks.

    They are quality parts that are proven to work in both guns and received great feedback and have excellent functionality.

    1. Best AR Pistol Grip: Ergo Grips - AR-15 Suregrip Tactical Deluxe Grip

    It is the right pistol grip for a shooter with large hands. It is a larger, heavier AR grip with a more pronounced palm swell than the standard Ergo grip.

    It is impervious to oils and solvents, providing a superior gripping surface when wet or used with gloves, as well as being ambidextrous oriented. The grip includes a mounting screw with a locking washer.


    • Looks good
    • Easy-to-install
    • Good value
    • Tough
    • Works with many guns


    • May be too big for people with small hands

    Bottom Line

    This grip only takes 2 minutes to change and gives you a sure and comfortable grip in all conditions. We recommend this model to people with large hands looking for a comfortable and intuitive feeling grip that can take on any punishment.

    2. Best AR Buttstock: Double Star - AR-15 Socom Stock Collapsible Mil-Spec

    The best buttstock for the AR platform is the collapsible stock from Double Star. The Tactical carbine stock allows two inches of length adjustment, while allowing adjustment of length to five different positions.

    If you want a fixed-length stock, easily convert it using the included machine screw. With this, the soft foam cover on the tube provides a comfortable cheek weld.

    Additional features include a rubber recoil pad, a machined-in hammer for breaching doors, a receiver end plate for single-point slings, and 3 sling slots. The buttstock is machined from aluminum for strength and durability.


    • Aesthetically pleasing
    • Easy-to-Install
    • Good value
    • Tough
    • Works with many guns


    • A bit heavy, but robust

    Bottom Line

    If you need a tough, and functional buttstock for tactical purposes, that is both comfortable and easy-to-use, look no further. It will work with most slings, and the adjustable length is a nifty feature.

    3. Best AR Trigger: Airborne Arms LLC - AR-15 AAGT Geronimo Trigger System

    The single-stage Airborne Arms AAST Geronimo Trigger System is built-around Airborne’s M.S.A.T. (Modular Shooter Adaptive Trigger) technology, which allows it to be adapted to the shooting style of each shooter.

    The hammer/trigger spring tension is adjustable, and the 7075 T6 aluminum trigger shoes are replaceable.

    Proper fitting provided by the trigger shoe improves shooter accuracy and split times between shots. The oversized anti-walk/rotation hammer and trigger pins keep the trigger in place in the receiver.

    The trigger is machined from a high-grade A2 tool steel alloy, and the contact surfaces are hand-ground and polished to ensure a creep-free trigger pull and a crisp, abrupt, consistent break.


    • Designed, tested, and manufactured entirely in the USA
    • Crisp and consistent break
    • Improved accuracy
    • Easily adjustable
    • Solid and robust


    • Pricey for a trigger

    Bottom Line

    The trigger is one of the most critical parts of your AR builds so choose a trigger that feels right. It is the top trigger thanks to its adjustable pull weight, clean break, and robust design.

    4. Best AR Gas Block: Odin Works Inc. - AR-15 Low Profile Gas Block

    The gas block from ODIN Works is adjustable and machined from steel and black nitrided for durability.

    Its front-facing Inconel adjustment screw and spring can handle high temperatures, and you can adjust it through 20 clicks of ball detent adjustment.

    The gas block can fit any barrel with .750 diameter and works with any caliber.


    • Durable
    • Adjustable
    • Easy-to-install


    • The design is too big and blocky
    • May need modification to fit some handguards

    Bottom Line

    This versatile and highly effective gas block will reduce the recoil of your AR build while at the same time allowing smooth adjustments. It may not fit perfectly with every handguard though, so check the dimensions before buying.

    5. Best AR Front Sight: Troy Industries, Inc. - AR-15 Fixed Front Battle Sight

    This rail-mounted, fixed, same-plane front sight will fit any AR-style rifle Picatinny railed forend or gas block that is the same height as the receiver rail.

    You can pair it with a flip-up rear sight as a back-up for a scope too. The HK-style globe-shaped ears aid in fast target acquisition, while the serrated, angled ramp eliminates glare.

    Users can adjust the elevation in ½ MOA increments and keep the adjustments locked with the positive-locking detent.


    • Reliable
    • Easy-to-install
    • Good value
    • Rugged
    • Works with many guns


    • None

    Bottom Line

    Loved by AR enthusiasts, this front sights gives rapid sight acquisition and a classy look to your gun. It works great and is sturdy, so it won’t fall off or need adjusting.

    6. Best AR Rear Sight: A.R.M.S.,Inc - AR-15 40L Low Profile Rear Sight

    This model is a rugged, flip-up rear sight made from anodized aluminum and stainless steel. It works with A2-height front sights and can be co-witnessed through an optic. Users can mount it easily on a Picatinny rail and secure it with the safety wire.

    With this, it can also use the dual apertures together or fold down the first one and use the second alone. A non-snagging lever brings the spring-loaded sight into the ready position.


    • Rugged
    • Reliable
    • Easy-to-install
    • Good value
    • Made in USA


    • A little pricey

    Bottom Line

    The flip-up sights make it easier to stow and remove your rifle from its case, while the feature-packed sights make aiming and shooting at your targets a breeze. You will be satisfied with the build quality and robustness of these sights.


    When purchasing parts for your AR build, you may want to keep in mind whether they are interchangeable between the AR-15 and the AR-10, especially if you plan to have both.

    While we’ve listed the commonly interchangeable parts above, you should check with the manufacturer. If in doubt, you should check out our top picks for the interchangeable parts above.

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