CMMG Mk3 308 Lower Parts Kit Gunbuilder's

CMMG Mk3 308 Lower Parts Kit

This is a smart choice for the AR-10 builder who knows what he wants. CMMG's Gunbuilder's Kit includes the essential components needed to assemble your lower receiver group, while leaving room for your personal preferences on the trigger and grip.

What's Included

The kit provides:

• Trigger guard
• Magazine catch and release button
• Bolt catch and spring
• Takedown pins and springs
• Selector lever and detent
• Safety selector spring
• All necessary springs and hardware

What You'll Need to Source

• Fire control group (trigger and hammer assembly)
• Pistol grip

This approach lets you select a trigger that matches your shooting style and a grip that fits your hand, rather than settling for standard components.

Specifications

Caliber: 308 Winchester

Compatibility: CMMG Mk3 lowers and most LR308-pattern lower receivers

Standards: All components meet or exceed mil-spec requirements

Why This Matters

Building your own lower receiver is a rewarding project that gives you complete control over your rifle. By excluding the commonly upgraded components, CMMG lets you invest in the trigger and grip that will actually improve your shooting. The remaining parts are solid mil-spec quality—exactly what you need.