- The CMMG® MK3 Gun Builders Kit Includes Most Of The Necessary Parts To Build Up Your Lower Group Except The Commonly Upgraded Parts. Does Not Include Fire Control Group Or Pistol Grip. Compatible With CMMG MK3 Lowers And Most LR308 Type Lowers.
- Kit Includes: Bolt Catch & Screw-In Pin, Bolt Catch Plunger & Spring, Trigger/Hammer Retaining Pins, Safety, Detent, & Spring, Magazine Catch, Spring, & Release Button, Pivot/Takedown Pins, Detents, & Springs, Buffer Retainer/Spring.