Introducing the CMMG Mk57 Complete Bolt Carrier Group Repair Kit 5.7x28mm, a testament to precision engineering and robust design. This kit is crafted to ensure seamless functionality and ease of use, featuring high-quality components that promise reliability and longevity. Ideal for range time and training, this repair kit is a must-have for firearm enthusiasts looking to maintain their equipment in top condition. CMMG is renowned for its innovation and commitment to quality, making this kit a trusted choice for many.

Key Features:
- Manufacturer: CMMG
- Model: Mk57
- Caliber: 5.7x28mm
- What's In The Box: Bolt 5.7x28mm, Firing Pin, Firing Pin Retainer Pin, Key (RDB), Key Screw X 2, Bolt Cam Pin, Extractor, Ejector, Ejector Spring, Bolt Spring (RDB)