AR-40 .40 S&W / 10mm Bolt Carrier Group – BCG

• US Made 8620 steel with black nitride finish
• Ramped carrier to work with both 9mm and standard AR hammers
• Precision milled for use with Glock style lower receivers
• M-16 cut for use in transferable full auto MG’s, dealer post sample MG’s or other legal machine guns (ALL BATFE RULES APPLY)
• This bolt can also be used in a large frame lower to run 10mm

**NOTE: Many Aftermarket drop in triggers use modified hammers which may not reset properly, or hit the firing pin square on the carrier which could cause firing pins to bind and snap. We recommend using only MILSPEC hammers with any 9mm, .40, or .45 blowback bolt carrier groups.

**A small amount of Loctite is recommended on the set screw that holds the BCG weight in place.