The CMMG 55CA601 Gun Builders kit is an AR-15 lower parts kit designed for builders who plan to add their own trigger, grip, and other upgraded components. It provides the core small parts needed to complete a mil-spec AR-15 lower while letting you choose your preferred fire control group and furniture.
Key Features
- Model: CMMG 55CA601 Gun Builders kit
- Platform: AR-15 lower receiver
- Parts included: Bolt catch, bolt catch plunger, bolt catch spring, bolt catch roll pin
- Parts included: Trigger and hammer retaining pins
- Parts included: Safety selector, safety detent, safety detent spring
- Parts included: Magazine catch, magazine catch spring, magazine release button
- Parts included: Pivot pin, takedown pin, pivot pin detent and spring, takedown pin detent and spring
- Parts included: Buffer retainer and buffer retainer spring
- Compatibility: Fits most mil-spec AR-15 lower receivers
Special Features
- Omits commonly upgraded parts such as the trigger group, pistol grip, and often the trigger guard so builders can choose premium components.
- All parts are made to meet or exceed mil-spec dimensions for reliable fit and function in AR-15 lowers.
- Organized as a dedicated Gun Builders kit to simplify sourcing small parts for custom builds.
- Ideal for replacing worn lower small parts or completing stripped lowers kept on hand for future projects.
- Backed by CMMG’s reputation for quality AR-15 components and build parts.
Practical Benefits
- Lets AR-15 builders pair the CMMG Gun Builders kit with their choice of aftermarket trigger, grip, and stock for a fully customized rifle.
- Saves time and hassle by providing all the critical pins, springs, and controls needed to get a lower operational.
- Useful for home builders, armorers, and shops that regularly assemble or service AR-15 platforms.
- A solid fit for budget conscious builds where reliability and mil-spec compatibility still matter.
- Practical choice for keeping a spare small parts kit on hand to quickly repair or complete an AR-15 lower.
The CMMG 55CA601 Gun Builders kit is a practical choice for AR-15 builders who want a reliable lower parts kit while still selecting their own trigger, grip, and other upgraded components.
| MANUFACTURER | CMMG |