CMMG MK3 Gun Builder’s Lower Parts Kit
The 308 version includes LR308 takedown, pivot pins, and an improved bolt catch. The 308 kits also include a bolt catch screw in place of the AR-15 pin.
Includes
- Takedown pin
- Receiver pivot pin
- Takedown pin detent (2)
- Takedown pin detent spring (2)
- Hammer and trigger pin (2)
- Safety selector
- Selector detent
- Magazine catch
- Magazine catch spring
- Magazine release button
- Bolt catch
- Bolt catch plunger
- Bolt catch spring
- Bolt catch spring pin
- Buffer retainer and buffer retainer spring.






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