The NLX 556 Bolt Carrier Group uses aerospace grade steel and precision machining to create the best Bolt Carrier Group for your AR15 build. We use only the best materials and practices including machined extractors and MPI Bolts to ensure that your Next Level Bolt Carrier will keep you shooting for years. Whether you shoot for fun, hunting, or rely on your rifle for self defense, you want a reliable Bolt Carrier Group. The Next Level AR15/M16 Enhanced Bolt Carrier Group provides improved function and durability through several integrated improvements over other BCGs. Next Level produces each carrier from 4140ph steel to aerospace tolerances. The expanded rear diameter of the carrier allows for smooth cycling in the buffer tube. We use machined extractors , not cast, and we include a black insert and o-ring during assembly for reliable extraction. Machined each bolt from SAE 4140ph high-grade steel, then shot peen and MPI inspect. This grade of steel combined with DLC or Nitride coating provides an extremely hard surface and a tough, ductile core resistant to structural failure and providing a long service life. We coat all internal parts with DLC/Nitride, including the firing pin, cam pin and extractor. During assembly we torque and stake hardened grade 8 gas key screws to mil-spec standards. Specifications for Next Level Armament NLX 5.56x45mm NATO AR-15 Complete Bolt Carrier Groups: Manufacturer: Next Level Armament Fabric/Material: 4140 Steel Cartridge: 5.56x45mm NATO Gun Make: AR Platform Gun Model: AR-15 Hand: Right Condition: New Weight: 1 lb Length: 12 in Bolt Material: Steel Carrier Material: 4140 steel Package Contents: Next Level Armament NLX 5.56x45mm NATO AR-15 Complete Bolt Carrier Groups
Rick R –
The Next Level Armament BCG is amazingly easy to clean because it has the DLC. As for the function, works like a charm
John Price –
Pleased with this carrier. Good machine work. Gas key is solid. Runs like a dream. I will be getting 4 or 5 more soon.
Punchballs –
The machining on the one I received is immaculate inside and out with a very smooth, even finish. No marks to be found. It's logoed nla and not the gear logo shown. It's always nice to find a bolt carrier that has attention to detail on all surfaces and not just the functional ones. Does it matter? No. Does it make me irrationally feel like it's a better bolt carrier? Yes.
Tony –
Everything looks well done… except for the complete lack of staking on the gas key. It is just a dent on the side of the key with no incidence on the gas key bolts.
Matt –
I love these bcg’s and own 4 of them. The carrier, bolt, cam pin, and firing pin are all dlc coated. The machining is fabulous and the raised boss helps with accuracy because the bcg fits more snuggly in the upper. The only complaint I have is 3 out of 4 of my carriers is missing some of the dlc coating in the 3 bore, hasn’t caused any probs though.
Shane –
Great item. Works flawlessy and I have had no failures