Quick view Battle Arms Development Battle Arms Development AR15 BCG Standard Bolt Carrier Group MSRP: $145.00 Battle Arms Development AR15 BCG Standard Bolt Carrier GroupDetails:Laser Engraved BAD INC LogoBolt Carrier: 8620 Steel Case Hardened, Machined from BilletFiring Pin: 17-4 H-900 Steel, Center-less GroundGas Key: 4140 Steel with Grade 8 Screws, Properly... Add to Cart Add to Wish List