CM10 308 Win 18″ Rifle AR10 – Cobalt Kinetics Green

This CM10 is engineered for supersonic 308 Winchester and compatible 7.62×51 NATO ammunition. It is not configured to cycle subsonic ammunition. Shooters seeking a semi-automatic system developed specifically for heavy subsonic loads should select the CM10 308 Subsonic AR10.

Photographs may show optics, suppressors or other accessories that are not included unless specifically listed.

CM10 308 DMR Rifle

The CM10 308 DMR Rifle combines an 18-inch 308 Winchester barrel with billet receivers, ambidextrous controls and an adjustable operating system. The additional barrel length supports velocity and downrange performance while retaining the fast follow-up capability of a large-frame semi-automatic rifle.

CM equips this 308 DMR Rifle with rifle-length gas, a Superlative Arms adjustable gas block and an adjustable AR10 buffer. These components allow the operating system to be balanced around the ammunition, suppressor and shooter rather than relying on a fixed gas and buffer arrangement.

The rifle accepts conventional dual-feed LR/SR-pattern magazines. It is chambered for 308 Winchester and can also fire compatible 7.62×51 NATO ammunition. Compare CM10 rifles, CM7S bolt-action firearms, ammunition and supporting components in District 308.

An 18-Inch Semi-Automatic 308 System

The 18-inch barrel provides additional velocity potential over shorter configurations without taking the CM10 into an unnecessarily long format. This balance makes the rifle suitable for supported field shooting, target work and applications where greater downrange capability is useful.

A DMR-style configuration should provide more than barrel length alone. The CM10 combines its 18-inch 5R barrel with a free-floating handguard, adjustable trigger options, a full-length optic rail and an operating system that can be tuned for suppressed or unsuppressed use.

The result is a 308 DMR Rifle that preserves semi-automatic handling while supporting intermediate and extended-range shooting with appropriate ammunition and optics.

Rifle-Length Gas and Suppressor Tuning

CM uses rifle-length gas to introduce operating pressure later in the firing cycle and moderate carrier speed. The adjustable gas block and adjustable buffer provide control over the gas entering the system and the resistance applied to the carrier.

This becomes especially useful when adding a suppressor. An enclosed suppressor can increase backpressure, carrier velocity and receiver gas. A flow-through suppressor can reduce those effects with supersonic ammunition. The CM10 operating system can be adjusted for either arrangement. See the 308 suppressor guide for a complete explanation.

CM10 Billet Receiver Set

• SR25-pattern receiver architecture with DPMS high-profile component compatibility
• CNC-machined from 7075-T6 billet aluminum
• Lightened fire-control housing and magazine-well surfaces
• Lightening cuts on the upper receiver
• Upper receiver without a forward assist
• Machined and flared magazine well
• Integral trigger guard
• Ambidextrous fire and safe markings
• Cobalt Kinetics Green Cerakote

Ambidextrous Lower Controls

• CM ambidextrous safety selector
• CM ambidextrous magazine release
• CM10 ambidextrous bolt release
• CM10 pivot and takedown pins
• B5 Systems grip in Coyote

Stock and Adjustable Buffer System

• B5 Systems Bravo stock in Coyote
• Adjustable carbine receiver extension
• QD receiver end plate
• Adjustable AR10 buffer
• Receiver extension finished in Cobalt Kinetics Green Cerakote

The adjustable buffer works with the adjustable gas block to control carrier speed and operating feel. This allows the complete operating system to be tuned rather than relying on the gas block alone.

TriggerTech AR Duty Trigger

The CM10 includes a TriggerTech AR Duty trigger with a choice of single-stage or two-stage operation. Its zero-creep release provides a clean, predictable break with minimal overtravel. Most customers select the single-stage trigger, although the two-stage option remains available for shooters who prefer a defined first stage.

CM10 Bolt Carrier Group

• Standard-mass carrier
• 9310 steel bolt
• High-pressure tested bolt
• Magnetic-particle-inspected bolt
• Shot-peened bolt
• Nitride-coated bolt, carrier and gas key
• Hardened gas key
• Grade 8 hardened gas-key fasteners
• Properly staked gas key
• Tool-steel extractor
• T.E.A. extractor spring
• Black extractor insert
• Crane O-ring

Charging Handle and Adjustable Gas System

• CM10 ambidextrous charging handle manufactured from 7075 aluminum
• Rifle-length melonite gas tube
• Superlative Arms .750-inch adjustable gas block with nitrided finish
• Adjustable AR10 buffer

CM10 LWS Free-Floating Handguard

The 15-inch CM10 LWS handguard free-floats the barrel and provides a rigid mounting surface for a bipod, sling and other field accessories.

• 15-inch length
• 6061 aluminum construction
• Dual-taper attachment system
• Steel barrel nut
• Full-length Picatinny top rail
• M-Lok attachment surfaces along the sides and bottom
• Integrated QD sling sockets at the 3- and 9-o’clock positions
• Cobalt Kinetics Green Cerakote
• B5 Systems rail covers in Coyote

18-Inch 308 Winchester Barrel

• Chamber: 308 Winchester
• Length: 18 inches
• Material: 416R stainless steel
• Rifling: 5R
• Twist rate: 1:10
• Gas-system length: Rifle
• Gas-block journal: .750 inch
• Muzzle thread: 5/8×24
• Finish: Tactical Grey Cerakote

Muzzle Device and Suppressor Use

The 5/8×24 muzzle thread supports common 308-caliber muzzle devices, direct-thread suppressors and suppressor mounts. Available muzzle configurations can vary with component availability and price. Contact CM before ordering if a particular suppressor interface is required.

The rifle-length gas system, adjustable gas block and adjustable buffer make this rifle well suited to suppressed supersonic operation. A flow-through suppressor can reduce excess backpressure and receiver gas, while an enclosed suppressor may require additional gas and buffer adjustment. Always follow the suppressor manufacturer’s caliber, barrel-length and mounting requirements.

Magazine

• One 10-round Magpul PMAG 7.62 LR/SR GEN M3 in Coyote
• Conventional dual-feed LR/SR magazine pattern
• Compatible higher-capacity LR/SR magazines may be used where permitted

Verified Dimensions

• Weight: 7 lb 14 oz with an unloaded magazine and no accessories
• Overall length: 35–38.25 inches
• Length of pull: 11.875–15.25 inches

Dimensions displayed elsewhere for shipping are packaged shipping dimensions and do not describe the rifle itself.

308 DMR Rifle FAQ

What does DMR mean for this CM10?

DMR means designated marksman rifle. For the CM10, it describes an 18-inch semi-automatic 308 configuration intended to balance handling, velocity and downrange capability. It does not imply a particular optic, ammunition selection or guaranteed effective distance.

Why choose the 18-inch barrel?

The 18-inch barrel offers additional velocity potential over shorter CM10 configurations while remaining manageable for field use. It is a practical choice when downrange performance is a higher priority than achieving the shortest possible firearm.

Will this rifle cycle subsonic 308 ammunition?

No. This CM10 is configured for the pressure and dwell time produced by supersonic ammunition. Choose the CM10 SUBSONIC when reliable semi-automatic operation with compatible heavy subsonic loads is required.

Can the CM10 fire both 308 Winchester and 7.62×51 NATO?

Yes. CM’s 308 Winchester firearms can use compatible 7.62×51 NATO ammunition. Always confirm that the ammunition is commercially manufactured, undamaged and appropriate for the firearm before use.

What magazine pattern does this rifle use?

The CM10 uses conventional dual-feed LR/SR-pattern 308 magazines. It does not use the AICS-pattern magazine found in the CM7S bolt-action platform.

Can this 308 DMR Rifle be suppressed?

Yes. The barrel has 5/8×24 muzzle threads, and the rifle-length gas system, adjustable gas block and adjustable buffer provide the tuning range needed for suppressed supersonic operation. The required suppressor mount or muzzle device depends on the selected suppressor.

Warranty

This complete rifle carries CM’s limited lifetime warranty for the original purchaser. Coverage applies to functional performance in the rifle’s original CM configuration and is subject to the complete warranty terms.

An 18-Inch CM10 for Downrange Capability

The CM10 308 DMR Rifle combines an 18-inch 5R barrel, rifle-length gas, Cobalt Kinetics Green billet receivers, ambidextrous controls and an adjustable operating system. It balances semi-automatic handling with the barrel length and supporting features needed for capable intermediate and extended-range use. Explore the complete 308 Winchester family in District 308.