The CMMG Gun Builder’s AR-15 Parts Kit contains most of the parts needed to build or maintain your lower receiver. Use as a spare parts kit for field repairs or to complete your next build. This kit does not include some of the most commonly upgraded parts such as the trigger guard, fire control group, or pistol grip, allowing you to customize those parts as you see fit.

Kit Includes

• Bolt catch/roll 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