LANTAC USA M-SPEC BCG .308/7.62mm Nickel Boron Bolt Carrier Group

The LANTAC USA M-SPEC Bolt Carrier Group is a precision-machined mil-spec BCG engineered for .308 Winchester / 7.62mm AR-10 platform rifles. The carrier is full-auto style with increased mass, cut from 8620 steel, case hardened, and hard turned and ground so that all internal dimensions are held to exact mil-spec tolerances.

The M-SPEC carrier uses an improved cam path that increases pressure dwell time on the bolt, holding it closed longer during firing - a useful feature for over-gassed AR-10 builds. The Nickel Boron finish on the carrier and bolt delivers a smooth, low-friction surface that simplifies cleaning and resists corrosion in the field.

Designed as a drop-in mil-spec replacement for AR-10 / LR-308 pattern rifles chambered in .308 Winchester / 7.62x51mm NATO, the LANTAC USA M-SPEC BCG is a reliable foundation for duty, hunting, and general-purpose builds.