6mm ARC Predator Hunting Rifle — CM15 18″
The 6mm ARC Predator Hunting Rifle from Chattahoochee Munitions combines our CM15 semi-automatic platform with an 18″ barrel, rifle-length gas system and adjustable gas block and buffer. This configuration features Cobalt Kinetics Green Cerakote on the receivers, handguard and buffer tube, complemented by B5 Systems Coyote furniture.
CM manufactures complete firearms with the barrel, operating components, controls and magazine considered together. This rifle includes a TriggerTech AR15 Duty trigger, ambidextrous controls and a 10-round DURAMAG selected for the CM15 6mm ARC platform.
A 6mm ARC Predator Hunting Rifle for Field Use
Predator hunting can involve changing positions, carrying equipment and preparing for opportunities from different shooting locations. The CM15 provides semi-automatic operation with an adjustable stock, a full-length Picatinny top rail and M-LOK attachment points for the equipment your application requires.
The 18″ configuration gives this 6mm ARC Predator Hunting Rifle a different overall length and weight from our 16″ CM15 offerings. Choose between them based on your preferred handling, equipment and field setup. Finish color identifies this listing; it does not change the rifle’s mechanical specifications.
18″ CM15 Barrel
The barrel uses 416R stainless steel with straight fluting and Black Cerakote. A 1:7 twist rate, shouldered crown and 5/8×24 muzzle threads complete the barrel specification.
- Chambering: 6mm ARC
- Barrel length: 18″
- Material: 416R stainless steel
- Profile feature: Straight fluting
- Finish: Black Cerakote
- Twist rate: 1:7
- Crown: Shouldered
- Muzzle threads: 5/8×24
- Gas journal: .750″
- Gas system: Rifle-length
Rifle-Length Gas and Adjustable Operating Components
This 6mm ARC Predator Hunting Rifle uses a rifle-length Melonite gas tube and a Superlative Arms .750″ adjustable gas block in DLC Coyote. An Odin adjustable AR15 buffer is included in the receiver extension.
These are standard components of this CM15 configuration. Suppressor selection, ammunition and the final equipment combination remain relevant to operation. Contact CM to discuss your intended configuration when ordering, particularly if the rifle will be used with an existing suppressor.
TriggerTech AR15 Duty Trigger
The current trigger specification is TriggerTech AR15 Duty. Available options are straight, curved or two-stage straight, each with a 3.5 lb total pull weight. Select the available option that matches your preferred trigger shape and operation.
Older product photographs may show a previous trigger configuration. The listed TriggerTech Duty specification describes the current offering.
Billet Receivers and Ambidextrous Controls
The upper and lower receivers are CNC-machined from 7075-T6 billet aluminum and finished in Cobalt Kinetics Green Cerakote. The lower includes an integral trigger guard, a machined magazine well with a wide flare and Fire/Safe pictogram markings on both sides.
- CM ambidextrous safety
- CM ambidextrous magazine release
- CM15 ambidextrous bolt release
- CM15 pivot and takedown pins
- B5 Systems Coyote grip
- Lightweight lower receiver with an 8.0 oz component weight
CM15 Low-Mass Bolt Carrier Group
The 6mm ARC Predator Hunting Rifle includes the CM15 low-mass bolt carrier group with a 9310 steel bolt. The bolt is high-pressure tested and magnetic-particle inspected. Nitride finishes are specified for the bolt, carrier and gas key.
- 9310 steel bolt
- HPT bolt: high-pressure tested
- MPI bolt: magnetic-particle inspected
- Nitride-coated bolt, carrier and gas key
- Gas key hardened to USGI specifications
- Grade 8 hardened gas-key fasteners, staked per military specification
- Tool steel extractor
- Carrier lightening cuts
The upper also includes a CM15 ambidextrous 7075 aluminum charging handle developed in collaboration with Breek Arms around the Warhammer design, plus the CM15 dust cover and forward assist.
15″ M-LOK Handguard
The CM15 LWS 15″ handguard uses 6061 aluminum construction with Cobalt Kinetics Green Cerakote. Its full Picatinny top rail provides mounting space, while M-LOK attachment points on the sides and bottom accommodate compatible accessories.
- Dual-taper attachment system
- Steel barrel nut
- QD sling attachment points at the 3 and 9 o’clock positions
- M-LOK attachment points on the sides and bottom
- Full Picatinny top rail
- B5 Systems Coyote rail covers
Stock, Furniture and Dimensions
A B5 Systems Bravo stock in Coyote completes the rear of this 6mm ARC Predator Hunting Rifle. The CM mil-spec buffer tube carries matching Cobalt Kinetics Green Cerakote, and a QD endplate provides an additional sling attachment location.
- Stock: B5 Systems Bravo — Coyote
- Grip: B5 Systems — Coyote
- Buffer tube: CM mil-spec — Cobalt Kinetics Green Cerakote
- Buffer: Odin adjustable AR15 buffer
- Overall length: 35.50″–38.75″
- Length of pull: 11″–14.25″
- Weight: 6 lb 12 oz with unloaded magazine and no accessories
These are firearm measurements. Weight and dimensions shown in the separate shipping information tab are for shipping purposes.
Included 10-Round DURAMAG
One 10-round DURAMAG in Coyote is included with the 6mm ARC Predator Hunting Rifle. The CM15 uses an AR-15-pattern magazine, while CM7S bolt-action firearms use AICS-pattern magazines.
For the correct CM15 magazine application and additional magazine details, see our 6mm ARC AR15 Magazine listing.
Muzzle Device and Suppressor Options
Product photographs depict a Dead Air KeyMo brake. Available alternatives may include an A2 birdcage, Yankee Hill brake, SilencerCo ASR or Rugged three-port brake. Contact CM to confirm your preferred muzzle device and any associated price adjustment.
For suppressed use, match the suppressor and mounting system to the cartridge, barrel length and muzzle interface. Our 6mm ARC Suppressor Guide explains CM’s platform-specific preferences, including flow-through or low-backpressure options for the semi-automatic CM15.
Warranty and the Overwatch 6 Lineup
This 6mm ARC Predator Hunting Rifle carries Chattahoochee Munitions’ limited lifetime warranty for the original purchaser, subject to the published terms covering functional performance in the original CM configuration.
Explore Overwatch 6 to compare complete CM15 and CM7S firearms, barreled actions, the CM15 upper and platform-specific magazines. Our 6mm ARC Rifle Guide provides further context for choosing between the semi-automatic and bolt-action platforms.
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