CMMG AR-15 Lower Parts Kit
The CMMG AR-15 Lower Parts Kit (55CA6C5) gives you every internal component required to complete a stripped mil-spec AR-15 lower receiver in one package. Inside you get the trigger group, hammer, disconnector, safety selector, bolt catch, magazine catch and release, pivot and takedown pins, buffer retainer, trigger guard, A2 pistol grip, and all associated springs, detents, and roll pins — sorted into color-coded packets to simplify assembly. The matte black finish matches standard mil-spec receivers and furniture, and every piece is built to drop into any AR-15 or M4-pattern lower. A solid foundation for first-time builders and experienced armorers alike working on 5.56/.223 platforms.
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- SKU
- 55CA6C5
$82.07
Description
Features
- Complete AR-15 Lower Build Kit — Includes every internal component needed to finish a stripped AR-15 lower receiver, minus the buttstock assembly.
- Mil-Spec Construction — Built to military specifications for guaranteed fit and function across any standard AR-15 lower receiver.
- Standard Single-Stage Trigger Group — Ships with trigger, hammer, disconnector, and matching springs for reliable factory-style fire control.
- A2-Style Pistol Grip — Classic A2 grip with grip screw and lock washer included, ready to install out of the bag.
- Color-Coded Assembly Packets — Small parts are sorted into labeled, color-coded bags to streamline the build and prevent lost detents or springs.
- Full Small-Parts Roster — Bolt catch, magazine catch, safety selector, pivot and takedown pins, trigger guard, buffer retainer, and all associated springs, detents, and roll pins.
- Matte Black Finish — Uniform black finish on metal components matches standard mil-spec lower receivers and furniture.
- AR-15 / M4 Compatible — Drops into any standard multi-cal AR-15 or M4-pattern lower receiver chambered in 5.56/.223 and similar mil-spec calibers.
- CMMG Quality Control — Sourced and inspected by CMMG, a long-standing AR builder trusted for complete uppers, lowers, and conversion kits.
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Customer Reviews
4.9
100% of customers recommend this product
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Top customer reviews
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Color coded bags saved my sanityThis was my first AR build and I was terrified of opening a bag of 30 tiny springs and detents and having no idea what goes where. CMMG thought of that everything comes in color coded bags so you know exactly which parts go together. Seriously whoever at CMMG came up with that idea deserves a raise. I had my stripped Aero lower fully assembled in about 45 minutes using a youtube video and a punch set. The trigger is standard mil-spec so its nothing fancy but it breaks clean and resets positive. Everything fit my lower perfectly with no oversized or undersized parts. For a first time builder this is THE lower parts kit to buy, the color coding alone is worth it over the cheaper no-name kits that just dump everything in one bag and wish you luck.
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good valueEasy to use, and the color coded bags saved a lot of time
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good valuecolor coded bags made thing simple
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Nicely OrganizedColor coded bags with matching parts lists save time trying to figure out were everything goes. Decent quality parts and reasonably priced. If you are assembling your first lower this kit is highly recommended.
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