This Battle Arms Enhanced Bolt Carrier Group is compatible with both COLT and GLOCK magazine configurations. Features reliable AR-15 style extractor claw with O-Ring and spring and broad trigger compatibility with ramped bottom geometry. Charging handle interfaces directly on bolt carrier surface that can withstand vigorous pulling force without the worry of shearing off the carrier key. Reinforced firing pin is held in place with standard firing pin cotter pin. FeaturesGLOCK and COLT Magazine CompatibleMilSpec 8620 Heat Treated Steel CarrierReliable External AR-15 Style ExtractorFull-Auto CompatibleCompatible with Most AR-15 TriggersDurable Hard Nitride Black FinishRemovable Carrier WeightCompatible with Dust CoverCompatible with BAD-CSS 9mm Buffer DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.