NBS .223/5.56/300BLK M16 Profile Left-Handed Bolt Carrier Group Black Nitride

The NBS AR-15 5.56/.223 Left-Handed BCG is the perfect starting point for our wrong-handed friends. This BCG has one of the best black nitride finishes we have seen, and comes in a mil-spec design with a lifetime warranty. The bolt is made from enhanced 9310 steel while the carrier is made from 8620 tool steel. It is shot-peened and magnetic particle inspected. Included: Bolt w/ D2 Extractor Bolt Carrier w/ staked Gas Key Cam Pin Firing Pin Firing Pin Retaining Pin Technical Specs: Gas system: Direct Impingement Caliber: 5.56x45mm NATO/.223 Rem, .300 Blackout Finish: Salt Black Nitride Bolt: 9310 Alloy Steel (High Hardness) Carrier: 8620 Aircraft Grade Steel Extractor: Shot Peened and Case Hardened D2 Tool Steel Firing Pin: Mil-spec 8740 steel with hard chrome finish Gas Key: Mil-Spec w/ properly staked Grade-8 screws & Permatex No. 3 sealed Cam Pin: 8620 Steel w/ Black Nitride Finish Quality Control: MPI Inspected for QC