| Platform | Mk3 |
| Safety Selector | CMMG Mil-Spec |
AR Parts Notice - State/local restrictions may apply in CT, DC, IL, MA, NJ, NY, or WA. Customers must review our Shipping Policy prior to ordering.
Lower Parts Kit, Mk3, Gunbuilder's Kit
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. Check out our LPK Install resource article for an interactive assembly guide and in-depth breakdown. All CMMG products come with our Lifetime Quality Guarantee.
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
**Not all 308 lowers are the same. Our kit is designed to work with our lowers and are “Mil-Spec”. We would recommend checking with the manufacturer of your lower for compatibility of parts if you are not using our receiver**