CMMG 38CA61A Gun Builders Lower Parts Kit 308 Win MK3 LR-308

The CMMG 38CA61A Gun Builders Lower Parts Kit is built for your 308 Win AR-10 platform lower. Designed as a streamlined Gun Builders Kit, it supplies the mil-spec small parts needed to complete a lower receiver group while leaving room for the builder to choose their own upgraded Fire Control Group and pistol grip.

Purpose-built for CMMG Mk3 lowers and fully compatible with most LR-308 pattern lowers, this LPK includes the essential lower receiver internals - bolt catch assembly, magazine release assembly, safety assembly, and takedown pins - all manufactured to meet or exceed mil-spec tolerances. The black finish matches standard AR-10 / Mk3 build aesthetics.

Drop this kit in as the foundation for a custom 308 Win build, or use it as a replacement parts set for an existing lower. Note that the kit does not include a fire control group or pistol grip, so those components must be sourced separately to complete your build.