CMMG’s Mk3 Gunbuilder’s Lower Parts Kit supplies the core mil‑spec components needed to assemble a .308 / 7.62 NATO lower for AR‑10 / Mk3 platforms. The kit contains most lower‑group parts while omitting items often upgraded by builders: the fire control group, pistol grip, and trigger guard are not included. Components are finished in black matte and are intended for compatibility with CMMG Mk3 lowers and many LR‑308 type receivers.
Key Specifications
- Compatible with CMMG Mk3 lowers and many LR‑308 type receivers.
- Caliber compatibility: .308 / 7.62 NATO.
- Includes most lower‑group components while excluding the fire control group, pistol grip, and trigger guard.
- Finish: Black matte.
- Material: Various.
- Product type: Parts kit for gunbuilder assemblies.
- Dimensions: 0.90 x 3.95 x 7.50 inches.
- All included components meet or exceed mil‑spec standards.
- Intended platform: AR‑10 / .308 gunbuilder use.
Built for reliability and straightforward assembly, this kit gives builders the essential mil‑spec parts while allowing choice of preferred fire control components and grip. Its black matte finish and broad LR‑308 compatibility make it a practical option for custom builds, repairs, and component upgrades where quality and interchangeability matter.
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