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

Toolcraft .223/5.56/300BLK M16 Profile Left-Handed Bolt Carrier Group - Black Nitride This Left-Handed BCG by Toolcraft is a high-quality BCG for our Left-Handed friends, so you don't have to worry about any more annoying brass being ejected across your body. The bolt is CNC machined from heavy-duty 9310 alloy steel, and the bolt carrier is made from 8620 steel. 9310 steel has a high core & fatigue strength rating, a high hardenability rating, and it's about 7% stronger than the Carpenter 158 steel used in most BCGs. The Toolcraft 5.56/.223/.300BLK Bolt Carrier Group features a Salt Black Nitride finish for exceptional corrosion and wear resistance. These M16 profile Direct Impingement BCGs are Magnetic Particle Inspected for quality control. They have hard-chromed 8740 steel firing pins and mil-spec gas keys with Grade-8 screws, staked and sealed with Permatex No. 3. They have shot-peened, case-hardened D2 steel extractors for reliable performance. NOTE- The Salt Black Nitride BCG offers the dark, subdued finish that doesn't change the specs of the Bolt Carrier, but it still makes the outside of the Bolt Carrier harder. This treatment extends the part's lifespan, makes it extremely wear-resistant and durable, and protects it from corrosion. Specifications 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 Included Bolt w/ D2 Extractor Bolt Carrier w/ staked Gas Key Cam Pin Firing Pin Firing Pin Retaining Pin