CM10 338 Federal 18″ AR10 Rifle – Cobalt Kinetics Green

338 Federal Rifle — CM10 Cobalt Kinetics Green

The 338 Federal Rifle from Chattahoochee Munitions brings the 338 Federal cartridge to the CM10 large-frame semi-automatic platform. This Cobalt Kinetics Green rifle features an 18-inch 416R stainless steel barrel, precision-machined 7075-T6 billet receivers, a TriggerTech Duty trigger, and an adjustable gas system.

Chattahoochee Munitions has extensive experience manufacturing rifles in less-common chamberings across its semi-automatic and bolt-action platforms. The CM10 reflects that experience through its receiver architecture, component selection, and integrated operating system.

The Cobalt Kinetics Green configuration combines Cerakoted receivers, a matching 15-inch M-LOK handguard, and a matching receiver extension with Coyote B5 Systems furniture. The result is a distinctive finish combination within the Variant Valley collection.

338 Federal Rifle — CM10 Receiver System

The CM10 uses an SR25-pattern receiver architecture with DPMS High Profile component specifications. Its upper and lower receivers are CNC-machined from 7075-T6 billet aluminum, with features intended to support structural integrity, component compatibility, and consistent fitment.

Upper and Lower Receiver Specifications

• Platform: CM10 large-frame semi-automatic
• Receiver Pattern: SR25 with DPMS High Profile specifications
• Material: CNC-machined 7075-T6 billet aluminum
• Barrel Nut Interface: 16 TPI
• Compatibility Architecture: DPMS High Profile barrel extension and bolt carrier group specifications
• Fire Control Group: Lightweight machined FCG faces
• Magazine Well: Machined with a wide flare
• Upper Receiver: Weight-reduction cuts without forward assist
• Trigger Guard: Integral to the lower receiver
• Safety Markings: Pictogram-style Fire/Safe engravings on both sides
• Receiver Finish: Cobalt Kinetics Green Cerakote

The CM10’s receiver system forms the foundation of this 338 Federal Rifle and accommodates the specified operating components and controls.

338 Federal Rifle — Lower Receiver Components

The CM10 lower receiver incorporates ambidextrous controls and a TriggerTech Duty trigger. Multiple trigger shoe and stage configurations are available while retaining a 3.5-pound total pull weight.

• Safety Selector: CM ambidextrous safety
• Magazine Release: CM ambidextrous magazine release
• Bolt Release: CM10 ambidextrous bolt release
• Pivot and Takedown Pins: CM10
• Trigger: TriggerTech AR15 Duty
• Trigger Options: Single-stage straight, single-stage curved, or two-stage straight
• Trigger Pull: 3.5 pounds total
• Pistol Grip: B5 Systems, Coyote

Receiver Extension and Stock

• Stock: B5 Systems Bravo, Coyote
• Receiver Extension: CM Mil-Spec buffer tube
• Buffer Tube Finish: Cobalt Kinetics Green Cerakote
• Endplate: Quick-detach compatible
• Buffer: Odin Works adjustable AR10 buffer
• Length of Pull: 11.875–15.25 inches

The Coyote Bravo stock complements the Cobalt Kinetics Green finish while providing an adjustable length of pull. The matching Cerakoted receiver extension maintains a consistent appearance between the upper and lower assemblies.

CM10 Bolt Carrier Group and Upper Components

This 338 Federal Rifle includes the CM10 bolt carrier group, a Warhammer ambidextrous charging handle, rifle-length gas components, and a 15-inch lightweight M-LOK handguard.

CM10 Bolt Carrier Group

• Bolt Material: 9310 steel
• Bolt Testing: High-pressure tested and magnetic-particle inspected
• Bolt Processing: Shot peened
• Bolt Finish: Nitride
• Carrier Finish: Nitride
• Gas Key Finish: Nitride
• Gas Key: Hardened to USGI specifications
• Gas Key Fasteners: Grade 8 hardened fasteners
• Gas Key Staking: Mil-Spec
• Extractor: Tool steel
• Extractor Spring: T.E.A.
• Extractor Insert: Black
• Extractor O-Ring: Mil-Spec Crane pattern

Charging Handle and Gas System

• Charging Handle: CM10 Warhammer ambidextrous charging handle
• Charging Handle Collaboration: Breek Arms
• Charging Handle Material: 7075 aluminum
• Gas System Length: Rifle length
• Gas Tube: CM rifle-length, Melonite finish
• Gas Block: Superlative Arms adjustable
• Gas Block Diameter: .750 inch
• Gas Block Finish: Melonite

The CM10 Warhammer charging handle is produced in collaboration with Breek Arms and provides ambidextrous charging controls.

The Superlative Arms adjustable gas block incorporates the manufacturer’s gas-management design. Its adjustable configuration is part of the CM10 operating system, alongside the Odin Works adjustable buffer.

15-Inch CM10 Lightweight M-LOK Handguard

The CM10 features a 15-inch lightweight M-LOK handguard manufactured from 6061 aluminum. Its dual-taper mounting architecture uses a steel barrel nut and provides multiple accessory attachment interfaces.

• Handguard: CM10 LWS
• Length: 15 inches
• Material: 6061 aluminum
• Finish: Cobalt Kinetics Green Cerakote
• Attachment: Dual-taper system
• Barrel Nut: Steel
• Top Rail: Full-length Picatinny
• Accessory Interface: M-LOK on sides and bottom
• QD Locations: 3 and 9 o’clock
• Rail Covers: B5 Systems, Coyote

The handguard, receivers, and buffer tube share the Cobalt Kinetics Green finish, while the Coyote rail covers complement the matching stock and pistol grip.

338 Federal Rifle — 18-Inch Barrel

The CM10 is chambered in 338 Federal using an 18-inch 416R stainless steel barrel with 5R rifling. Its 1:10 twist rate and rifle-length gas system are part of the specified configuration.

• Caliber: 338 Federal
• Barrel Length: 18 inches
• Material: 416R stainless steel
• Twist Rate: 1:10
• Rifling: 5R
• Gas System: Rifle length
• Gas Journal: .750 inch
• Muzzle Threads: 5/8×24
• Barrel Finish: Tactical Grey Cerakote

The Tactical Grey barrel finish contrasts with the Cobalt Kinetics Green receivers and handguard. The threaded muzzle accommodates appropriate compatible muzzle-device options, subject to the manufacturer’s specifications.

338 Federal Rifle — Suppressor Considerations

For supersonic semi-automatic rifle applications, Chattahoochee Munitions generally recommends a flow-through or low-backpressure suppressor.

Traditional enclosed suppressors can increase operating-system backpressure. Low-backpressure suppressors are designed to limit that additional effect, although actual performance depends on the suppressor and firearm configuration.

The CM10 incorporates both an adjustable gas block and adjustable buffer system. Suppressor compatibility and proper firearm operation must be verified for the specific configuration.

Any suppressor used with this rifle must be rated by its manufacturer for 338 Federal, the applicable barrel length, ammunition configuration, and mounting arrangement. Compatibility should never be inferred from bullet diameter alone.

338 Federal Magazine — Factory Magpul PMAG

Each CM10 338 Federal rifle includes one factory Magpul PMAG 10 LR/SR GEN M3 magazine with a 10-round capacity.

Chattahoochee Munitions has tested and verified this magazine for its CM10 rifles chambered in 338 Federal, 358 Winchester, and 7mm-08 Remington. The factory Magpul configuration requires no CM-specific modifications for these verified chamberings.

For additional magazine specifications, see the 358 Winchester Magazine — 338 Federal and 7mm-08 CM10 listing.

CM10 338 Federal Cobalt Kinetics Green — Dimensions and Finish

• Overall Length: 35–38.25 inches
• Weight: 7 lb 14 oz with unloaded magazine and no accessories
• Length of Pull: 11.875–15.25 inches
• Receivers: Cobalt Kinetics Green Cerakote
• Handguard: Cobalt Kinetics Green Cerakote
• Receiver Extension: Cobalt Kinetics Green Cerakote
• Barrel: Tactical Grey Cerakote
• Stock: B5 Systems Bravo, Coyote
• Pistol Grip: B5 Systems, Coyote
• Rail Covers: B5 Systems, Coyote
• Included Magazine: One 10-round Magpul PMAG

Published dimensions and weight describe the firearm itself. Shipping-package dimensions and shipping weight are listed separately where applicable.

Explore Variant Valley — 308 Based Cartridges

The 338 Federal Rifle belongs to Variant Valley, the Chattahoochee Munitions destination for CM10 rifles chambered in 338 Federal, 358 Winchester, and 7mm-08 Remington.

These three cartridges share the 308 Winchester parent case but differ in bullet diameter, ammunition characteristics, and traditional hunting applications.

Learn about their common origins in the 308 Winchester Cartridge Family Guide, or examine their differences in the 338 Federal vs 358 Winchester Comparison Guide.

338 Federal Rifle — Frequently Asked Questions

What barrel does the CM10 338 Federal use?

The CM10 338 Federal Cobalt Kinetics Green has an 18-inch 416R stainless steel barrel with 5R rifling, a 1:10 twist rate, rifle-length gas system, and Tactical Grey Cerakote finish.

What trigger options are available?

The rifle uses a TriggerTech Duty trigger with single-stage straight, single-stage curved, and two-stage straight options. Each has a 3.5-pound total pull weight.

Does the 338 Federal CM10 use a standard magazine?

Yes. The rifle includes a factory Magpul PMAG 10 LR/SR GEN M3 with a 10-round capacity. CM has tested and verified the unmodified magazine for this chambering.

What suppressor type does CM recommend?

For supersonic CM10 semi-automatic rifles, Chattahoochee Munitions generally recommends a flow-through or low-backpressure suppressor. The suppressor manufacturer’s cartridge, barrel-length, and mounting restrictions must be followed.

What is the finish combination?

The receivers, handguard, and receiver extension feature Cobalt Kinetics Green Cerakote. The barrel has Tactical Grey Cerakote, while the B5 Systems Bravo stock, pistol grip, and rail covers are Coyote.

Chattahoochee Munitions Limited Lifetime Warranty

This CM10 rifle is covered by the Chattahoochee Munitions Limited Lifetime Warranty, subject to the applicable terms and conditions.

The warranty applies to the original purchaser and includes limitations involving functional performance, the firearm’s original configuration, misuse, and unauthorized modifications.

For full warranty terms, consult the Chattahoochee Munitions warranty policy.