Description The Lantac M-SPEC 7.62/.308 bolt carrier group is machined to mil-spec dimensions with enhancements for reliable service in AR-10 and DPMS-pattern platforms. The carrier uses a full-auto style design with increased mass and is produced from 8620 steel that is case hardened and hard turned/ground. The bolt is machined from Carpenter 158 or 9310 and is shot peened and hard turned per military specification. A QPQ nitride finish is applied to increase corrosion resistance and durability, and the assembly ships with a domed 17-4PH stainless cam pin to reduce friction and wear. Key Specifications Made by Lantac USA for consistent OEM naming and fit. Model designation is M-SPEC reflecting mil-spec dimensions with select enhancements. Chambering indicated in product naming as 7.62/.308. Designed to fit AR-10 / DPMS-pattern rifles. The carrier is manufactured from 8620 steel and is case hardened. The bolt is machined from Carpenter 158 or 9310 and is shot peened and hard turned. Surface treatment uses a QPQ nitride finish for improved corrosion resistance and wear. The included cam pin is 17-4PH stainless, domed and hardened for reduced friction. This BCG is offered with a lifetime warranty and is made in the USA. Built to provide mil-spec compatibility with a few targeted upgrades, the M-SPEC BCG is a practical component for builders and maintainers who want a durable, hard-finished bolt carrier group for 7.62/.308 AR-10 style rifles. Its combination of treated 8620 carrier, Carpenter-class bolt construction, and QPQ nitride finish yields a robust part well suited to routine range use and reliable function in a variety of duty and recreational applications.