CMMG’s Gun Builders Kit includes most of the necessary parts to build up your lower group except the commonly upgraded parts. Does not include Trigger Guard, Fire Control Group, and pistol grip.
- Rear takedown pin, Spring & Detent
- Front takedown pin, spring & Detent
- Mag Catch, release & spring
- Selector, selector spring & detent
- Buffer retainer & spring
- Bolt catch, plunger, pin & Spring
- Hammer pin & trigger pin