358 Winchester Rifle — CM10 Cobalt Kinetics Green
The 358 Winchester Rifle from Chattahoochee Munitions brings 358 Winchester to the CM10 large-frame semi-automatic platform. This Cobalt Kinetics Green configuration features an 18-inch CrMV barrel, precision-machined billet receivers, a TriggerTech Duty trigger, and a rifle-length gas system with a Superlative Arms adjustable gas block.
Part of Variant Valley, this complete rifle combines Cobalt Kinetics Green receivers, handguard, and receiver extension with Coyote B5 Systems furniture. The barrel receives a contrasting Tactical Grey Cerakote finish.
Compare the chamberings in our 338 Federal vs. 358 Winchester article, or explore their broader cartridge context in our 308 Winchester Cartridge Family guide.
358 Winchester Rifle Features
CM manufactures firearms across both bolt-action and semi-automatic platforms, including less mainstream chamberings. The CM10 reflects that experience through its receiver configuration, component selection, and adjustable gas and buffer systems.
This 358 Winchester Rifle includes ambidextrous controls, a 15-inch M-LOK handguard, and an adjustable B5 Systems Bravo stock. Its component package provides a consistent CM10 layout for customers seeking an alternative chambering in a familiar large-frame AR platform.
CM10 Upper and Lower Receivers
- Receiver configuration: SR25 pattern with DPMS High Profile specifications
- Barrel nut threads: 16 TPI
- Construction: CNC-machined 7075-T6 billet aluminum
- Lightening cuts around the fire-control area and magazine well
- Upper receiver lightening cuts with no forward assist
- Pictogram-style Fire/Safe markings on both sides
- Integral trigger guard
- Machined magazine well with a wide flare
- Finish: Cobalt Kinetics Green Cerakote
Lower Receiver Components and Trigger
- CM ambidextrous safety
- CM ambidextrous magazine release
- CM10 pivot and takedown pins
- CM10 ambidextrous bolt release
- B5 Systems Coyote pistol grip
- Trigger: TriggerTech Duty
- Trigger options: Single-stage straight, single-stage curved, or two-stage straight
- Total trigger pull weight: 3.5 lb for all options
Stock and Receiver Extension
- B5 Systems Bravo stock — Coyote
- CM mil-spec receiver extension — Cobalt Kinetics Green Cerakote
- QD endplate
- Odin adjustable AR10 buffer
CM10 Bolt Carrier Group
- 9310 steel bolt
- High-pressure-tested bolt
- Magnetic-particle-inspected bolt
- Shot-peened bolt
- Nitride-coated bolt, carrier, and gas key
- Gas key hardened to USGI specifications
- Grade 8 hardened gas-key fasteners, staked per mil-spec
- Tool steel extractor
- T.E.A. extractor spring
- Black extractor insert
- Mil-spec Crane O-ring
Charging Handle and Gas System
- CM10 ambidextrous charging handle manufactured in collaboration with Breek Arms
- Charging handle material: 7075 aluminum
- CM rifle-length gas tube — Melonite finish
- Superlative Arms .750-inch adjustable gas block — Melonite finish
The rifle-length gas system and adjustable gas block are paired with an Odin adjustable buffer. These components provide adjustment capability for the rifle’s operating system.
CM10 LWS Handguard
- Length: 15 inches
- Material: 6061 aluminum
- Finish: Cobalt Kinetics Green Cerakote
- Dual taper attachment system
- Steel barrel nut
- QD attachment points at the 3 and 9 o’clock positions
- M-LOK attachment slots on the sides and bottom
- Full Picatinny top rail
- B5 Systems Coyote rail covers
358 Winchester Rifle Barrel Specifications
The CM10 uses an 18-inch CM 358 Winchester AR10 barrel with CrMV construction, 5R rifling, and a 1:14 twist rate. Tactical Grey Cerakote completes the barrel exterior.
- Caliber: 358 Winchester
- Barrel length: 18 inches
- Barrel material: CrMV
- Rifling: 5R
- Twist rate: 1:14
- Muzzle threads: 5/8×24
- Gas journal: .750 inch
- Barrel finish: Tactical Grey Cerakote
Muzzle Device Selections
The rifle is pictured with a SilencerCo ASR muzzle device. Alternative selections may include Rugged, Dead Air KeyMo, Yankee Hill, or Q Cherry Bomb, subject to the options available for this product.
Any selected muzzle device and suppressor must accommodate the .358-inch projectile diameter and be approved by their manufacturers for 358 Winchester. A matching thread pitch alone does not establish compatibility.
Magazine, Weight, and Dimensions
- Included magazine: One 10-round PMAG 7.62 — Coyote
- Overall length: 35–38.250 inches
- Weight: 7 lb 14 oz with unloaded magazine and no accessories
- Length of pull: 11.875–15.25 inches
The weight and dimensions listed in the shipping tab are for shipping purposes. The firearm measurements are provided above.
Explore Variant Valley and Related Articles
This 358 Winchester Rifle belongs to Variant Valley, your destination for this part of the CM caliber lineup. Use the hub to explore related complete firearms, then consult the articles below for additional cartridge information.
- Variant Valley: Explore the hub and related CM configurations.
- 338 Federal vs. 358 Winchester: Read the cartridge comparison.
- 308 Winchester Cartridge Family: Explore the broader cartridge-family guide.
- CM10 Collection: View additional large-frame semi-automatic configurations.
For more information about the adjustable gas-system component included with this rifle, visit Superlative Arms.
Limited Lifetime Warranty
This rifle includes CM’s limited lifetime warranty, limited to the original purchaser and subject to the warranty terms regarding functional performance and the original firearm configuration.
358 Winchester Rifle FAQ
What barrel does this rifle use?
This configuration uses an 18-inch CrMV barrel chambered in 358 Winchester, with 5R rifling, a 1:14 twist rate, 5/8×24 muzzle threads, and Tactical Grey Cerakote.
Which trigger options are available?
TriggerTech Duty options include single-stage straight, single-stage curved, and two-stage straight. Each option has a total pull weight of 3.5 lb.
Which parts receive Cobalt Kinetics Green Cerakote?
The upper and lower receivers, 15-inch CM10 LWS handguard, and receiver extension receive Cobalt Kinetics Green Cerakote. The B5 Systems Bravo stock, pistol grip, and rail covers are Coyote.
What magazine is included?
The rifle includes one Coyote 10-round PMAG 7.62 magazine.
Does this configuration include adjustable gas and buffer components?
Yes. The rifle includes a Superlative Arms .750-inch adjustable gas block and an Odin adjustable AR10 buffer.
Where can I compare 338 Federal and 358 Winchester?
Read our 338 Federal vs. 358 Winchester article, then return to Variant Valley to explore the related CM firearms.
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