AR-40 .40 S&W / 10mm Bolt Carrier Group – BCG (Glock Compatible)
US Made 8620 steel with mag phosphate finish
Ramped carrier to work with both 9mm and standard AR hammers
Precision milled for use with Glock style lower receivers
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.