Next Level Armament NLX308 .308 / 7.62 Bolt Carrier Group - NibX Nickel Boron
Next Level Armament's NibX (Nickel Boron) Enhanced Bolt Carrier Group provides improved function and operation via several key improvements. The nickel boron finish provides superior lubricity and hardness, and the expanded rear of the carrier allows for smooth cycling in the buffer tube. Major internal parts are nickel boron coated, including the firing pin, cam pin and extractor. The extractor (machined from billet not cast) includes a black insert and o-ring for reliable extraction. Gas key screws are hardened Grade 8 and are properly torqued & staked. Bolt is machined from SAE 4140ph high-grade steel. This material makes for an extremely hard surface with a tough, ductile core resistant to structural failure and providing a long service life. Bolt is shot peened and MPI inspected. Carrier is machined from 4140ph steel to aerospace tolerances.