CMC Triggers .223 Rem/5.56/.300 Blackout Enhanced Bolt Carrier Group, Black Nitride - 81631

CMC Triggers Enhanced Bolt Carrier Group BCG AR15/M16 5.56/.223 .300 Blackout Mil-Spec Black Nitride. CMC Triggers manufactures the highest quality firearms components in the industry. Carrier Assembly: The flared rear of the enhanced bolt carrier is designed to reduce carrier tilt/cant during recoil and increasing reliability by strategically relocating key bearing surfaces. The CMC enhanced carrier has fewer points of contact resulting in less friction area and the increase in mass ensures proper gas pressures and increases dwell time thus improving extraction while shooting suppressed or short-barreled rifles (SBRs) Case-hardened 8620 steel (complete care is taken during the heat treat process so as to not harm the metal) 3 forward ports enlarged to allow over pressure to escape Optimized for suppressor use Black Nitride Finish 4130 Steel attached with Grade 8 hardware torqued and properly staked into a milled valley around a fully encased ejection port area for added strength and rigidity. Hardened 4340 cam pin. Mil Spec firing pin made of 8740 steel center-less ground and Hard Chrome coated. Bolt Assembly: The Bolt is true Mil Spec dimension and external surfaces are CNC ground after heat treat for a precision fit. These bolts are held to the highest possible tolerance possible. The trumpet area behind the gas rings where carbon normally collects is precision CNC Ground after heat treatment to ensure as smooth of an area as possible easing clean up and longevity. 9310 Case Hardened Steel All Bolt components Shot Peened & Black Nitride coated 4340 Steel Manganese Phosphate coated Magnetic Particle Inspected (MPI) and High Pressure Tested (HPT) Black Nitride low friction coating Mil Spec Extractor Spring & O-Ring BLACK NITRIDE is a process commonly referred to anonymously with SBN (Salt bath nitride) and sometimes QPQ (quench polish quench). All of these are a form of nitrocarburizing which is a chemical hardening of steel in short. Black Nitride Finish Benefits: Increased wear resistance Improved fatigue strength Better corrosion resistance Withstand corrosion per ASTM spec B117 Improved lubricity Enhanced cosmetic appeal Better corrosion protection at equivalent or lower costs than hard chrome nickel plating Specifications for CMC Triggers Enhanced AR Bolt Carrier Group (BCG): Manufacturer: CMC Triggers Color: Black Finish: Nitride Fabric/Material: Hardened 8620 Steel Hand: Right Bolt Material: 9310 Steel Carrier Material: 8620 Steel Package Contents: CMC Triggers Enhanced AR Bolt Carrier Group CMC Triggers 81631: Enhanced Bolt Carrier Group AR15/M16 5.56/.223 .300 Blackout Mil-Spec Black Nitride