Spike's Tactical 5.56 Bolt Carrier Group – Nickel Boron Finish

The Spike's Tactical 5.56 Bolt Carrier Group delivers reliable cycling for AR-15 platform rifles chambered in 5.56 NATO and .223 Remington. This full-auto profile BCG features a nickel boron (NiB) coating that reduces friction and simplifies cleaning compared to standard phosphate finishes. Designed as a direct replacement for worn or damaged carrier groups, it's also a popular upgrade for shooters who want easier maintenance and smoother operation.

The nickel boron finish is applied to all contact surfaces, providing a slick, self-lubricating surface that resists carbon buildup. Properly staked gas key and MPI-tested bolt ensure reliable function. This is a drop-in component for mil-spec AR-15 upper receivers—no gunsmithing required. Simply remove your old BCG, inspect and lubricate, then install.

• Part Type: Bolt Carrier Group
• Compatible Firearms: AR-15, 5.56 NATO, .223 Remington
• Material: 8620 steel carrier, Carpenter 158 steel bolt
• Finish: Nickel Boron (NiB)
• Profile: Full-auto
• Installation: Drop-In
• Includes: Bolt carrier, bolt assembly, cam pin, firing pin, firing pin retaining pin