CMMG LPK 308 WITHOUT GRIP/FIRE CONTR

Description

The CMMG Mk3 Gunbuilder’s Lower Parts Kit is built for those assembling or repairing a .308/7.62 NATO lower and who intend to select their own fire control group and pistol grip. By leaving those two components out, the kit avoids charging you for parts you were going to replace anyway — fire control groups and grips are the most commonly upgraded components in any lower build, so shipping them as a separate purchase makes practical sense for a deliberate builder.

The kit is designed around CMMG’s Mk3 platform and is engineered to mil-spec dimensions, meaning it is broadly compatible with most LR-308 pattern lowers beyond CMMG’s own receivers. That said, the .308 ecosystem is less standardized than the AR-15 pattern, so confirming compatibility with your specific lower before ordering is worthwhile — CMMG notes this directly. One detail worth knowing: the bolt catch uses a screw-in pin rather than a press-fit roll pin, so your lower needs to be drilled and tapped to accept it.

Included hardware covers every other functional element of the lower group: bolt catch with plunger and spring, trigger and hammer pins, safety selector with detent and spring, magazine catch assembly, pivot and takedown pins with their detents and springs, and the buffer retainer with its spring. Parts arrive organized for straightforward installation, and CMMG’s own LPK install guide — available on their site — walks through the assembly process in detail. All CMMG products are backed by the company’s Lifetime Quality Guarantee.