Luth-AR Bolt Carrier Group, Black Finish, 223/556 BC-A-223

For Left Side Ejecting UppersNickel Boron Coated223/556Bolt and Carrier Group Black Rain Ordnance, Inc. is a precision firearms manufacturer specializing in modern sporting rifle designs and high...

Mil-Spec dimensionsBolt Carrier Group Material: Case Hardened 8620Bolt Material: Case Hardened 9310 SteelFinish: All Bolt components - Black NitrideMPI: Magnetic Particle InspectedHPT: High Pressure...

Machined from 8620 alloy steel5.56 Bolt is machined from Carpenter 158 tool steelHigh pressure tested The heart of a reliable AR-15 build is a quality 5.56 bolt carrier group assembly. These are the...

CRN Coated, SilverCarpenter 158 bolt that is ground after heat treat8620 Steel Construction The F-1 Firearms DuraBolt Black Nitride direct impingement full auto rated M16/M4 bolt carrier group, for...

11.7oz weight helps to increase lock time and smoother operationFull Auto and Semi-Auto CompatibleForward Porting, enlarged ventsBalanced flared boss8620 Carrier, Heat Treated, Hard Turned and...