This Spikes Tactical bolt carrier group is chambered for .223 Remington/5.56x45mm NATO and built on a mil-spec, full-auto-rated M16 carrier profile (brand part no. ST5BG03). Spikes Tactical coats the bolt, carrier, and gas key in nickel boron inside and out, which resists corrosion and reduces friction for smoother cycling than a phosphate finish, then laser-engraves the carrier with the Spikes Tactical spider logo. It ships complete with a mil-spec extractor, gas key, firing pin, cam pin, and retaining pin, so it drops straight into a compatible AR-15 or M16 upper. It’s a dependable BCG for shooters who want a smoother-running, easier-to-clean alternative to a standard phosphate carrier.

Key Specifications

• Chambered for .223 Remington/5.56x45mm NATO, full-auto M16-rated carrier.
• Nickel boron coating inside and out resists corrosion and reduces friction for smoother cycling.
• Laser-engraved with the Spikes Tactical spider logo.
• Mil-spec carrier dimensions for broad AR-15/M16 compatibility.
• Includes a mil-spec extractor, gas key, firing pin, cam pin, and retaining pin.

Frequently Asked Questions

Is this bolt carrier group full-auto rated? Yes, it uses a mil-spec M16 full-auto carrier profile.

What finish does this BCG use? Nickel boron, inside and out, which resists corrosion and reduces friction versus a phosphate finish.

What’s included with the BCG? A mil-spec extractor, gas key, firing pin, cam pin, and retaining pin.

Buy the Spikes Tactical Nickel Boron 5.56 BCG

Order this nickel boron BCG from our Lubbock, Texas gun shop and complete your 5.56 AR-15 or M16 build. Browse our full AR bolt carrier groups lineup for more finishes. Ships fast from a Lubbock, TX gun shop.