The CMMG Endeavor Mk3 is a semi-automatic rifle built on the Mk3 (AR-10/LR-308/DPMS Gen 1 high-pattern) platform and chambered for .308 Winchester (7.62 NATO). It pairs a 20-inch 416 stainless steel barrel with a user-focused parts package — including the CMMG ZEROED controls, Magpul MOE stock and an EML15 M-LOK handguard — to support accurate, repeatable performance at extended ranges. The rifle ships with a Magpul 20rd PMAG and a CMMG ZEROED muzzle brake to manage recoil and follow-up shots.
Key Specifications
- Action is Semi-Auto on the Mk3 (AR-10) platform.
- Chambered in .308 / 7.62 NATO.
- The barrel measures 20 inches and is intended for extended-range performance.
- Barrel material and finish: 416SS SBN with a nitride-style finish noted in the manufacturer text.
- Barrel twist is 1:10.
- Muzzle device is the CMMG ZEROED Muzzle Brake.
- Muzzle thread pattern is 5/8 x 24.
- Upper receiver is Billet 7075 T6 Aluminum.
- Handguard is the CMMG EML15 M-LOK for accessory mounting.
- Includes a Magpul 20rd PMAG with a 20-round capacity.
Purpose-built to deliver predictable, long-range performance from a familiar AR-style platform, the Endeavor Mk3 balances durable construction with field-proven components. Its combination of a 20-inch stainless barrel, modular M-LOK handguard and CMMG ZEROED controls makes it well-suited for precision-focused shooting and hunting scenarios where a capable, adaptable rifle is required.
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