VFC M4 OEM GBB Reinforced Bolt Carrier Group w/ V3 NPAS Nozzle, Black

Your GBB rifle's bolt carrier group takes the most punishment in the system — cycling, gas pressure, temperature — and when it wears, the whole rifle feels rough. This is VFC's replacement, built to put that reliability back in.

The V3 NPAS nozzle. That's the part you'll actually use. NPAS is VFC's adjustable gas control system built into the nozzle itself. Turn the threaded sleeve clockwise to tighten and reduce gas flow, counterclockwise to open it up. You can dial your FPS to match different field limits or seasonal temperature changes without changing springs or other internal parts. It's one of the most practical upgrades you can make to a GBB platform.

The bolt carrier itself. Zinc alloy body, reinforced steel gas key, reinforced steel fore block, and a steel feed nozzle guide that runs the full length through the carrier and locks down — fewer places for things to come loose under stress. Everything bolts in to the spec your factory build was cut for, so there's no version mismatch to worry about.

What you need to know. Around 7 ounces. Zinc alloy, steel, nylon, and rubber construction. Drops straight in on VFC M4, VR16, and SR16 lines, including both V2 and V3 systems. Installation requires opening the upper receiver — standard GBB maintenance — and you'll want a chronograph on hand once you're reassembled to dial in the nozzle setting.