Mitchell Defense Enhanced ArmorLube M16 5.56mm NATO/.300 BLK Bolt Carrier Group Black. 56 and .300 BLK platforms. Its ArmorLube surface treatment - an advanced DLC coating developed with U.S. Army DEVCOM - achieves 97000 abrasion cycles far surpassing nitride and phosphate finishes. This ultra-hard coating prevents galling corrosion and carbon adhesion keeping the carrier running clean during extended firing sessions. A Carpenter 158 bolt pairs with a billet extractor and O-ring for consistent case control while SP4-coated gas rings offer a 3-4x lifespan increase and reduced friction. The 8620 M16 carrier is precision ground to perfectly flat bearing surfaces for smoother operation and reduced wear. The gas key is Permatex-sealed torqued to spec and secured with OCKS-pattern staking. A chrome-plated firing pin and rubber extractor gasket further enhance reliability making this BCG ideal for duty use high-volume shooters and suppressed configurations. Specifications for Mitchell Defense Enhanced ArmorLube M16 5.56mm NATO/.300 BLK Bolt Carrier Group: Manufacturer: Mitchell Defense Color: Black Finish: Anodized Fabric/Material: Steel Caliber: 5.56x45mm NATO .300 AAC Blackout Gun Make: AR Platform Gun Model: AR-15 Features of Mitchell Defense Enhanced ArmorLube M16 5.56mm NATO/.300 BLK Bolt Carrier Group ArmorLube DLC coating developed with U.S. Army DEVCOM; tested to 97000 abrasion cycles Outperforms nitride and phosphate finishes in wear and corrosion resistance Carpenter 158 bolt with billet extractor and O-ring Precision-ground 8620 M16 carrier for perfectly flat bearing surfaces SP4-coated gas rings for 3-4x extended lifespan OCKS-staked Permatex-sealed gas key Chrome-plated firing pin for long-term ignition reliability Rubber extractor gasket for enhanced extraction Designed for 5.56 NATO and .300 BLK platforms Package Contents: Mitchell Defense Enhanced ArmorLube M16 5.56mm NATO/.300 BLK Bolt Carrier Group What firearm models does the manufacturer say Mitchell Defense Enhanced ArmorLube M16 5.56mm NATO/.300 BLK Bolt Carrier Group is compatible with? The manufacturer says that Mitchell Defense Enhanced ArmorLube M16 5.56mm NATO/.300 BLK Bolt Carrier Group is compatible with AR-15Mitchell Defense 611001: Enhanced ArmorLube M16 5.56mm NATO/.300 BLK Bolt Carrier Group Black