FailZero AR-15 Bolt Carrier Group 450 Bushmaster Nickel Boron

The FailZero AR-15 Bolt Carrier Group is a fully assembled bolt carrier group designed to drop into Mil-Spec AR-15 upper receivers chambered for 450 Bushmaster. It is intended as a replacement or upgrade component for a rifle in that configuration.

The bolt and extractor, M16 cut bolt carrier, cam pin, carrier key, and firing pin are coated with EXO Nickel Boron, which the listing describes as providing permanent dry lubricity, improved wear and corrosion resistance, and easier cleanup. The extractor hardware includes a heavy spring, silicone insert, and o-ring intended to increase extraction tension. The finish is silver.

• Type: Bolt Carrier Group
• Platform: AR-15
• Caliber: 450 Bushmaster
• Fits: Mil-Spec AR-15 upper receivers chambered for 450 Bushmaster
• Finish: Nickel Boron
• Color: Silver
• Condition: Fully assembled