CMMG ZEROED Enhanced Lower Parts Kit MK3

CMMG's ZEROED line is their upgraded small parts, and this is the MK3 version built for their large frame lowers. The ambidextrous safety selector and ambidextrous magazine catch are the headline pieces, along with heavy duty pivot and takedown pins, detents, springs, and the bolt catch and buffer retainer hardware that a bare receiver needs.

Parts arrive in color coded packets, which keeps the detents and springs sorted while the lower goes together. The fire control group, trigger guard, and pistol grip are not part of the kit, so budget for those separately. Anyone building on an MK3 receiver should confirm parts fitment against the receiver in hand before starting.