CMMG Endeavor Mk3
CMMG Inc. · Rifle · In Production · 2018
Overview
The CMMG Endeavor Mk3 is the flagship long-range rifle of CMMG's lineup - a large-frame AR-10 pattern semi-automatic chambered in 6.5 Creedmoor and .308 Winchester with 20-to-24-inch match-grade 416 stainless steel barrels. Built on CMMG's Mk3 (DPMS high-pattern LR-308) platform with billet 7075-T6 aluminum upper and lower receivers, the Endeavor Mk3 is configured for precision: a Geissele SSA two-stage trigger, an adjustable Magpul PRS precision stock, a CMMG SV muzzle brake, a rifle-length gas system with adjustable gas block, and a 15-inch M-LOK free-float handguard. The 6.5 Creedmoor 20-inch model weighs about 8.9 pounds with a 1:8 twist barrel and feeds from 20-round Magpul PMAG LR/SR magazines, delivering sub-MOA capability to ranges past 1,000 yards. The 24-inch configurations add velocity for the most demanding long-range work. The Endeavor Mk3 is CMMG's most capable distance platform, trading the compactness of the Resolute and Banshee for genuine precision-rifle performance in a semi-automatic package.
Specifications
| Weight (empty) | 4037 g (142.4 oz) |
| Weight (loaded) | 4308 g (152.0 oz) |
| Overall Length | 1049 mm (41.30") |
| Barrel Length | 508 mm (20.00") |
| Action Type | Gas Operated Direct Impingement |
| Firing Mechanism | Hammer Fired |
| Trigger Type | Two Stage |
| Trigger Pull | 20 N (4.5 lbf) |
| Magazine Capacity | 20 rounds |
| Magazine Type | Detachable Box |
| Muzzle Velocity | 838 m/s (2749 fps) |
| Muzzle Energy | 3070 J (2264 ft·lbf) |
| Effective Range | 1000 m (1094 yd) |
| Maximum Range | 5000 m (5468 yd) |
| Barrel Rifling | Right Hand |
| Rifling Twist | 203 mm (7.99") |
| Number of Grooves | 6 |
| Frame Material | Aluminum Alloy |
| Barrel Material | Stainless Steel |
| Stock Material | Polymer |
| Finish | Hard Anodized |
Calibers
- 6.5mm Creedmoor · primary — also known as 6.5 Creedmoor, 6.5 CM
- .308 Winchester · 7.62x51mm NATO — also known as 7.62x51mm NATO, 7.62 NATO, .308 Win
Features
- Firing modes: Semi Automatic
- Feed systems: Detachable Box Magazine
- Safety mechanisms: Manual Safety Selector, Firing Pin Safety
- Features: M Lok Handguard, Free Floating Handguard, Ambidextrous Controls, Picatinny Rail, Threaded Barrel, Adjustable Stock, Two Stage Trigger, Muzzle Brake, Match Barrel, Adjustable Gas System, Precision Stock
Variants
- Endeavor Mk3 .308 Win — Caliber Variant
- Endeavor Mk3 24" — Barrel Length
Production
Production years: 2018-present
Exact production numbers not disclosed by CMMG.
Origin
Country of origin: United States
Notes
MSRP approximately $1,899-2,200 depending on caliber and barrel. The Endeavor Mk3 is the long-range AR-10; reviews report it as a capable 1,000-yard semi-auto. Earlier production used the 'Endeavor 300 Mk3' naming. Geissele SSA trigger and Magpul PRS stock are standard on many configurations.
Background
Reviewers took the Endeavor 300 6.5 Creedmoor to 1,000 yards and beyond, establishing CMMG's reputation for building affordable precision-capable semi-automatic rifles rather than only carbines and PCCs.