CMMG AR-15 Gunbuilder Lower Parts Kit
Core lower-receiver parts without a fire control group, trigger guard, or pistol grip.
- Price
- $35
- Brand
- CMMG
- Category
- Lower Parts
Featured in
Features
- •No fire control group
- •No pistol grip
- •No trigger guard
- •Color-coded clam-pack
- •Pins, springs, catches, and selector included
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CMMG Gunbuilders AR-15 Lower Parts Kit - 55CA601
Price History
90-day low $35.19 · at low nowMore AR-15 guides & articles
Guides
Overview
CMMG's 55CA601 Gunbuilder kit supplies the small parts that finish a stripped AR-15 lower around the trigger and grip. It includes the takedown and pivot pins, bolt catch, magazine catch, safety selector, buffer retainer, and the matching springs and detents.
The fire control group, trigger guard, and pistol grip are not included. Pick those parts separately. The labeled clam-pack keeps the small components organized during assembly.
Key Features
- Takedown and pivot pins with detents and springs
- Bolt catch and magazine catch assemblies
- Safety selector with detent and spring
- Buffer retainer and spring
- Labeled clam-pack for organized assembly
- Standard AR-15 lower-receiver fit
Pros
- +Does not make you pay for a trigger or grip you plan to replace
- +Labeled packaging makes the small parts easy to identify
- +Covers the standard catches, pins, selector, and springs
- +Fits standard AR-15 lower receivers
Cons
- −Requires a separate fire control group
- −Requires a separate pistol grip
- −Trigger guard is not included
- −Costs more than some other small-parts-only kits
Detailed Specifications
- compatibility
- AR-15 / M4 platforms
- pinDiameter
- .154" standard (small pin)
- Finish
- Phosphate on steel components
- Material
- Steel construction per mil-spec
- includesFCG
- No - trigger group sold separately
- includesGrip
- No
- includesTriggerGuard
- No
- safetySelector
- Yes - standard selector with detent and spring
- partNumber
- 55CA601
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Build Your Custom Configuration
Add the CMMG AR-15 Gunbuilder Lower Parts Kit to your build and see how it enhances your platform.