AR-15 .223/5.56 Bolt Carrier Group - DLC

AR-15 .223/5.56 Bolt Carrier Group - DLC The .223/5.56 DLC Bolt Carrier Group was designed with strength in mind. Starting with a 9310 Steel Bolt, which is aircraft-grade material, this bolt has a high core strength rating, a high fatigue strength, and a high hardenability rating. 9310 steel, when treated properly, is about 7% better than Carpenter 158 steel, so you know that you will have a dependable BCG, when you drop this into your rifle. This BCG (Bolt Carrier Group) has been DLC Coated, so that it can provide a long-lasting experience, and provide a significant upgrade to your AR-15. DLC is quickly becoming one of the most desirable finishes for critical weapon components for the following reasons: Hardness (Rockwell) - Greater hardness rating compared to unpolished Nickel Boron (90RC vs 82RC) Coefficient of Friction - Lower coefficient of friction compared to Nickel Boron (.15 vs .5-.8) These BCG's have also been Magnetic Particle Inspected and have been made to Mil-Spec Standards. It also has17-4 H-900 Stainless Steel Firing Pins, Mil-Spec Gas Keys with Grade-8 screws that are staked and sealed with Permatex No.3, and they have shot-peened case-hardened D2 tool steel extractors. Technical Specs: * Gas system: Direct Impingement * Caliber: 5.56x45mm NATO/.223 Rem, .300 Blackout * Finish: DLC * Bolt: 9310 Alloy Steel (High Hardness) * Carrier: 8620 Aircraft Grade Steel * Extractor: Shot Peened and Case Hardened D2 Tool Steel * Firing Pin: 17-4 H-900 Stainless Steel * Gas Key: DLC coated w/ properly staked Grade-8 screws & Permatex No. 3 sealed * Cam Pin: 8620 Steel w/ Black Nitride Finish * Quality Control: MPI Inspected for QC