Ideal to replace out of spec, worn or broken bolt groups or for that custom build. Each bolt group will work and fit on semi or full auto MP5K 40 & MP5K style 10mm firearms.

This is the finest US BCG available. Each bolt group comes complete, assembled ready to go:

• Bolt head complete
• #25 LO locking piece
• Firing pin
• Firing pin spring
• Full auto bolt carrier (works in semi and F/A)
• All parts use ordnance grade steel, heat treated to HK factory specifications. As an added bonus each bolt group counts as 2 US made compliant parts. This is simply the finest bolt group made. Made right here in the USA with all of the latest upgrades, material & improvements.