My Account (Sign in)
Your basket is empty.
0
Basket
contact us by phone Help and contact
Free standard delivery over £199
100-day return policy
My Account (Sign in)
Wish list
Your basket is empty. (0)
Basket
Newsletter 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 W/ AMBIDEXTROUS SELECTOR Support

The CMMG AR-15 Lower Parts Kit includes all essential components for smooth assembly and operation, featuring a Mil-Spec trigger and A2 pistol grip.

CMMG AR-15 LOWER PARTS KIT W/ AMBIDEXTROUS SELECTOR

815835012339 100054304
Variations
Filters:
Variations:

Variations:

The CMMG AR-15 Lower Parts Kit includes all essential components for smooth assembly and operation, featuring a Mil-Spec trigger and A2 pistol grip.
AR-15 LOWER PARTS KIT W/ AMBIDEXTROUS SELECTOR
Not available
Make: AR-15 Product no.: 100054304
Not available
111.92 GBP 0 £111.92 *
The CMMG AR-15 Lower Parts Kit includes all essential components for a complete build, featuring high-quality parts for reliable performance and easy assembly.
LOWER PARTS KIT AR-15
99.9 GBP 0 £99.90 *
Backorderable
Make: AR-15 Product no.: 100011594
Backorderable
99.9 GBP 0 £99.90 *
99.9 99.9 2 GBP

Not available.

Product no.: 100054304

Mfr. No.: 55CA6B8

Notify on availability 111.92 GBP
99.9 99.9 2 GBP
Description Specification Customers reviews Accessories

CMMG AR-15 LOWER PARTS KIT W/ AMBIDEXTROUS SELECTOR

Notify on availability

Description:

Complete your AR-15 build with precision and quality.

The CMMG AR-15 Lower Parts Kit is an essential collection of components designed to help you complete or rebuild your AR lower receiver with ease and confidence. This comprehensive kit includes every internal part required for a smooth assembly, ensuring that your rifle operates flawlessly.

Key Features:

  • High-Quality Components: Each part is crafted to work in harmony, promoting optimal functionality.
  • Organized Packaging: Components are neatly packaged in colour-coded bags for easy identification and assembly.
  • Included Parts:
    • A2-style pistol grip
    • Mil-Spec trigger with a conventional, single-stage pull weight of 6 to 6½ lbs
    • Trigger spring
    • Hammer
    • Disconnector
    • Hammer/trigger retaining pins
    • Hammer spring
    • Bolt stop and screw
    • Selector and selector detent
    • Bolt catch
    • Magazine catch
    • Magazine release button
    • Front pivot pin
    • Rear takedown pin
    • Buffer retainer
    • Triggerguard assembly
    • All necessary pins, springs, detents, and screws
  • Compatibility: Fits mil-spec AR-15/M16 lower receivers.

Whether you're a seasoned gunsmith or a novice builder, the CMMG AR-15 Lower Parts Kit is designed to meet your needs and exceed your expectations.



Top takeaways

  1. The kit contains all internal parts needed to complete or rebuild an AR-15 lower receiver.
  2. High-quality components are designed to work together smoothly and are organized in color-coded bags for easy assembly.
  3. 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

  • Weapon type: 
    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

Customers reviews

Customer ratings (7)

4 / 5
Recommended

Brownells USA 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.

Recommended

Brownells USA 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.

Variations:

The CMMG AR-15 Lower Parts Kit includes all essential components for smooth assembly and operation, featuring a Mil-Spec trigger and A2 pistol grip.
AR-15 LOWER PARTS KIT W/ AMBIDEXTROUS SELECTOR
Not available
Make: AR-15 Product no.: 100054304
Not available
111.92 GBP 0 £111.92 *
The CMMG AR-15 Lower Parts Kit includes all essential components for a complete build, featuring high-quality parts for reliable performance and easy assembly.
LOWER PARTS KIT AR-15
99.9 GBP 0 £99.90 *
Backorderable
Make: AR-15 Product no.: 100011594
Backorderable
99.9 GBP 0 £99.90 *

Customers also bought

Oops! Something went wrong.

We encountered an error while loading this content. Please refresh the page to continue. If the issue persists, contact our customer support.

Site Navigation
Product Categories
Ordering
Customer Service

Welcome!

to Brownells UK, your destination for anything gun related. With our roots in a genuine passion for firearms, we bring you an unmatched selection of Gun Parts, Firearm Accessories, Gunsmithing Tools, Scopes & Red Dot Sights and Expert Knowledge.

Whether you're looking to maintain, repair, or upgrade, we've got what you need!

For Shooters, By Shooters
We share your enthusiasm and know exactly what you're looking for because we're part of the community.

Massive Selection
From the essentials to the unique, find everything under one roof.

Our blend of tradition and innovation
Shop with the convenience of modern technology, backed by a legacy of experience.

Browse our collection and discover why we're the trusted name in shooting sports & hunting.

Brownells Norge - Komplett utvalg av ladeutstyr, våpendeler, kuler, hylser, kikkerter, optikk og luftvåpen Brownells Österreich - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells Switzerland - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells Deutschland - Einer der größten Lieferanten für Waffenteile, Büchsenmacherzubehör & Schießsportzubehör Brownells France - Le plus grand fournisseur d'Accessoires pour le tir, Pièces détachées & Outils d'Armurier Brownells Iberica - El mayor proveedor de accesorios para el Tiro, Piezas y herramientas del armero. Brownells Sverige - Världens största leverantör av Vapendelar, Vapensmide Verktyg & Skyttetillbehör Brownells Suomi Brownells Italia - Il negozio del più grande rivenditore di componenti e accessori per armi da tiro, difesa e caccia Brownells Polska - Największy na świecie dostawca części broni, narzędzi rusznikarskich & akcesoriów strzeleckich Brownells Česko - Největší světový dodavatel součástí zbraní, střeleckého příslušenství a zbrojního nářadí
*
Prices inclusive of duty & VAT.

© 2026 Brownells UK
Part of the Brownells Europe Group

Logo Brownells
Classical viewClassical view Mobile viewMobile view
Back to top