AR-15 BCG with DLC on every part, a 4140ph carrier with an expanded rear, and a shot-peened, MPI-inspected bolt.
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Next Level Armament NLX 5.56x45mm NATO AR-15 Complete Bolt Carrier Groups DLC Dark Grey
The NLX556 DLC Bolt Carrier Group is Next Level Armament's premium AR-15 BCG. The carrier is machined from 4140ph steel with an expanded rear diameter that Next Level says smooths cycling in the buffer tube, and the bolt is machined from SAE 4140ph steel, then shot peened and magnetic particle inspected. The extractor is machined rather than cast and ships with an insert and O-ring, and the gas key uses hardened Grade 8 screws torqued and staked to mil-spec.
Every part, including the firing pin, cam pin, and extractor, is DLC coated. DLC is very hard and slick, so carbon wipes off quickly and the BCG runs with less lubrication than phosphate. It uses the standard .223 bolt face, which covers 5.56 NATO, .223, .300 Blackout, and .350 Legend.

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Add the Next Level Armament NLX556 DLC Bolt Carrier Group to your build and see how it enhances your platform.