CMMG MK3 Gun Builder's Lower Parts Kit - 38CA61A

The 308 version includes LR308 takedown and pivot pins as well as an improved bolt catch. The 308 kits also include a bolt catch screw in place of the AR-15 pin.

Kit 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.