The CMMG ZEROED Lower Parts Kit for MK3 .308 is a complete, high-quality lower parts kit designed specifically for the CMMG MK3 series rifles chambered in .308 Winchester (including the MK3, MK3+, and other AR-10 pattern rifles).
This kit includes all the essential components needed to build or rebuild a reliable .308 lower receiver, with CMMG’s ZEROED line quality – tighter tolerances, smoother operation, and premium finishes where it matters most. All parts are made in the USA and come in convenient color-coded packets for easy assembly.
Key Specifications:
- Designed for: CMMG MK3 .308 / AR-10 pattern lowers
- Material: High-quality steel components with corrosion-resistant finishes
- Compatibility: Most .308 / 7.62x51 AR-10 style lowers (including CMMG MK3 series)
- Includes: ZEROED Extended Bolt Catch, Trigger, Hammer, Ambidextrous Safety, Pins, Springs, Detents, and all necessary hardware
- Finish: Black
Why Choose the CMMG ZEROED MK3 .308 Lower Parts Kit?
- Complete & Ready-to-Build — Includes every part needed for a functional .308 lower receiver.
- ZEROED Quality — CMMG’s premium line ensures smoother trigger pull, better fit, and higher reliability.
- Perfect for MK3 — Specifically engineered for the CMMG MK3 platform while remaining compatible with most standard AR-10 lowers.
- Made in the USA — Backed by CMMG’s reputation for precision and durability.
This kit is the ideal choice for builders assembling a new CMMG MK3 .308 rifle or refreshing an existing lower.
