Your basket is empty.

Basket

Help and contact

Free standard delivery over £199

100-day return policy

Newsletter

Sale

Over 300,000 customers - we say thank you!

4.93/5 "Very good" (1400+ reviews)

40,000+ products for hunting and shooting sports

CMMG
AR-15 LOWER PARTS KIT

815835012339 100054304

Description
Ratings (7)

Complete kit contains every internal part needed to complete or rebuild an AR lower receiver. High-quality components are designed to work in coordination with each other to ensure smooth operation, and they come packaged in color-coded bags that organize related parts for easy assembly. Includes molded-polymer A2 pistol grip, Mil-Spec trigger that offers a conventional, single-stage 6 to 6½ lb. service rifle pull.

SPECS: Kit includes A2-style pistol grip, trigger, trigger spring, hammer, disconnector, hammer/trigger retaining pins, hammer spring, bolt stop and screw, selector, selector detent, bolt catch, magazine catch, magazine release button, front pivot pin, rear takedown pin, buffer retainer, triggerguard assembly, and all necessary pins, springs, detent and screws. AR-15/M16 fits mil-spec AR-15/M16 lower receivers.

More...

Customer ratings for CMMG AR-15 LOWER PARTS KIT W/ AMBIDEXTROUS SELECTOR

Number of ratings: 7
From brownells.com: 7
Average rating: 4

CMMG LPK (10/04/2013)

I found this kit to be out of spec. The mag release button was extremely small compared to others I had. I didn't bother trying to install. I give it one star but is not Brownells fault.

Perfect!! (19/04/2013)

Fit is perfect on Rainier & BCM stripped lowers. I have yet to have a problem with any of them having fitting issues. Great product!! I have yet to install their trigger group because I use Geissele triggers on all my builds so, i can't speak for the trigger assemblies...

Excellent LPK for the price! (10/05/2013)

I recently installed three of these kits into Seekins Precision lowers and have to say I'm extremely satisfied. These kits went in smooth and have one of the best triggers I've seen in a LPK of this price range. I definitely recommend this LPK if you're doing a basic build.

Good kit - easy to use (30/06/2015)

As a first time builder I found this kit easy to use. The color coded groups were very helpful and the parts went together well. The only thing I would have liked to see added to the kit would be the tool for installing the pivot pin detent. I would recommend it to a friend.

Excellent Trigger (21/01/2016)

This kit was easy to install in my 80% lower build. I am amazed by the trigger for the amount I paid. I was eventually going to buy a replacement two stage trigger but not after shooting this one. All parts fit with tight tolerances and work flawlessly.

Real Roll Pin, Please (23/07/2016)

Used the premium lower parts kit in an 80% build. Really liked the color-coded packages, as they not only positively identified each pin and spring, but helped keep parts in logical build order. Went together nicely UNTIL I noticed that the bolt catch pin was NOT a roll pin (that type of non-roll 'roll pins' have given me fits other times), so did not use it in the build. The extended/ambi bolt catch I used came with a REAL roll pin so that's what was used. I also had a Brownell's roll pin on hand as inexpensive "frustration insurance" but it wasn't needed this time.

Nice kit (22/08/2018)

It's a nice kit with all the parts separated in color coded plastic bags.

One issue I ran into was with the safety selector detent spring. It's so strong that after the installation, it would require a wrench to turn the selector. I had to cut two coils off the spring to make it fit correctly.

Read 7 more ratings on brownells.com

94.9 94.9 2 GBP

Product no.: 100054304
CMMG AR-15 LOWER PARTS KIT W/ AMBIDEXTROUS SELECTOR
Mfr Part: 55CA6B8 815835012339 Complete kit contains every internal part needed to complete or rebuild an AR lower receiver. High-quality components are designed to work in coordination with each other to ensure smooth operation, and they come packaged in color-coded bags that organize related parts for easy assembly. Includes molded-polymer A2 pistol grip, Mil-Spec trigger that offers a conventional, single-stage 6 to 6½ lb. service rifle pull.

Notify on availability

Not available.

Specs: Make: AR-15

Add to shopping list

Ask question

Details

Add to shopping list

Ask question

Top takeaways

The kit contains all internal parts needed to complete or rebuild an AR-15 lower receiver.
High-quality components are designed to work together smoothly and are organized in color-coded bags for easy assembly.
Includes a variety of parts such as A2 pistol grip, Mil-Spec trigger, and ambidextrous selector, fitting mil-spec AR-15/M16 lower receivers.

Attributes

Make: AR-15 Delivery weight: 0.272kg Shipping height: 51mm Shipping width: 127mm Shipping length: 279mm UPC : 815835012339

Item details

Made in USA
US export classification: 0A501.c

Product no.: 100011594
CMMG LOWER PARTS KIT AR-15
Mfr Part: 55CA6C5 852005002080 Complete kit contains every internal part needed to complete or rebuild an AR lower receiver. High-quality components are designed to work in coordination with each other to ensure smooth operation, and they come packaged in color-coded bags that organize related parts for easy assembly. Includes molded-polymer A2 pistol grip, Mil-Spec trigger that offers a conventional, single-stage 6 to 6½ lb. service rifle pull.

94.9 GBP 95 £94.90 *

Delivery time approx. 7-14 days.
More than 10 pieces in USA warehouse

Specs: Make: AR-15

Add to shopping list

Ask question

Details

Add to shopping list

Ask question

Upgrade your AR-15 with the CMMG Lower Parts Kit! 🛠️ Complete with high-quality components for smooth operation and easy assembly.

Description
Ratings (7)

More...

Customer ratings for CMMG AR-15 LOWER PARTS KIT W/ AMBIDEXTROUS SELECTOR

Number of ratings: 7
From brownells.com: 7
Average rating: 4

CMMG LPK (10/04/2013)

I found this kit to be out of spec. The mag release button was extremely small compared to others I had. I didn't bother trying to install. I give it one star but is not Brownells fault.

Perfect!! (19/04/2013)