Dirty Bird AR-15 Bolt Carrier Group Nickel Boron 5.56/.223/300 BLK

Dirty Bird AR-15 5.56/.223/300BLK Bolt Carrier Group - Nickel Boron The Dirty Bird Industries Nickel Boron Bolt Carrier Group is built for shooters who want smoother operation, easier maintenance, and dependable performance from their AR-15. Its nickel boron coating reduces friction, helps resist carbon buildup, and improves cleanup after hard use. Built to Mil-Spec dimensions with quality materials throughout, it is a strong upgrade for .223, 5.56 NATO, and .300 Blackout rifle builds. Features Compatible with 5.56 NATO, .223 Remington, and .300 Blackout Nickel boron coating on the bolt, carrier, and gas key Reduced friction for smoother cycling Helps prevent carbon buildup for easier cleaning Forward assist serrations Shrouded firing pin Forged Mil-Spec gas key with Grade 8 hardware and proper staking Made in the USA Backed by the Dirty Bird Industries Lifetime Warranty Specifications Platform Compatibility: AR-15 Caliber Compatibility: 5.56 NATO / .223 Remington / .300 Blackout Carrier Material: 8620 tool steel Bolt Material: 9310 carpenter steel Finish: Nickel boron Gas Key: Forged Mil-Spec, properly staked Hardware: Grade 8 Inspection: Magnetic particle inspected Bolt Treatment: Shot peened Extractor: Tool steel Extractor Spring Setup: Mil-Spec spring, black insert, Viton O-ring Weight: 11.52 oz