Noveske N4 Low Mass 5.56 DLC Bolt Carrier Group

When you're building a precision AR-15 that demands faster cycling, reduced reciprocating mass, and a BCG that pairs perfectly with an adjustable gas system, the Noveske N4 Low Mass 5.56 NATO DLC Bolt Carrier Group delivers Noveske's signature quality in a reduced-mass carrier finished in Diamond-Like Carbon for hard use durability.

The Noveske N4 Low Mass BCG is a bolt carrier group designed for AR-15 builders and precision shooters who want reduced reciprocating mass for improved cycling speed, recoil impulse management, and enhanced performance when paired with an adjustable gas block or suppressor-equipped host rifle.

Reduced reciprocating mass in the bolt carrier group is a meaningful performance upgrade on gas-adjustable and suppressor-optimized AR-15 builds. Less carrier mass means less energy required to cycle the action, allowing the gas system to be tuned down further for reduced recoil impulse and bolt bounce — while still cycling reliably across a range of ammunition and conditions. The Diamond-Like Carbon (DLC) finish provides exceptional surface hardness and a very low coefficient of friction, reducing wear on the carrier and upper receiver while improving cleaning efficiency compared to phosphate or chrome-lined alternatives. The Carpenter No. 158 bolt is shot-peened for improved fatigue resistance and MPI (Magnetic Particle Inspected) tested before leaving Noveske's Oregon facility to verify structural integrity and freedom from defects. The result is a BCG built to Noveske's exacting standards — designed with the same care and attention that goes into Noveske's complete rifle systems.

Caliber: 5.56 NATO / .223 Remington. Carrier: low mass profile, DLC coated. Bolt: Carpenter No. 158 steel, shot peened, MPI tested. Finish: Diamond-Like Carbon (DLC). Manufacturer: Noveske Rifleworks, Oregon, USA. Weight and exact dimensions not specified in source data — confirm for spec column.

Carpenter No. 158 bolt with shot peening and MPI inspection ensures structural integrity and fatigue resistance. DLC finish delivers exceptional surface hardness and low friction for long-term reliability and easy maintenance.

An excellent choice for suppressed AR-15 builds, gas-adjustable precision platforms, and competitive shooting setups where reduced reciprocating mass and premium DLC finish provide a measurable performance advantage.

Backed by Noveske Rifleworks' manufacturer warranty. Noveske is based in White City, Oregon, and has built premium AR-15 components and rifles since 2004.