Next Level's no-frills nitride AR-15/M16 bolt carrier group.

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NLX556 AR-15 Nitride Bolt Carrier Group
Next Level Armament NLX 5.56x45mm NATO AR-15 Complete Bolt Carrier Groups Nitride Black
The NLX556 Nitride Bolt Carrier Group is Next Level Armament's entry AR-15/M16 BCG, which it describes as a no-frills but effective option for a rifle used for fun, hunting, or home defense. The nitride finish resists corrosion and cleans up more easily than phosphate.
Next Level publishes far less detail for this group than for its NLX556 DLC BCG, so a builder who wants the documented spec list (4140ph carrier, machined extractor, MPI bolt, staked Grade 8 screws) should pay up for the DLC version. It uses the standard .223 bolt face.

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