Precision machined from forged 7075 T6 aluminum, the CMMG Mk4 AR-15 stripped lower receiver is the quality mil-spec lower ready to be the foundation for your next build. The Mk4 stripped lower comes standard in a Armor Black finish and can be assembled using any mil-spec Lower Parts Kit.
Accepts any mil-spec lower parts kit
Forged 7075 T6 Aluminum
Compatible with all AR-15 calibers
CMMG lower Receivers are forged from high-strength, 7075 T6 aluminum for reliable performance and outstanding durability. Machined to Military Specifications & Standards.
Made In United States of America