CM10 458 SOCOM Rifle – 16″ Cobalt Kinetics Green

CM10 458 SOCOM Semi Automatic Rifle – 16″ Cobalt Kinetics Green

The Chattahoochee Munitions CM10 458 SOCOM Semi Automatic Rifle is a purpose-built large-frame implementation of .458 SOCOM designed around heavy projectiles, center feeding and extended cartridge overall length. Instead of being constrained by conventional AR-15 magazine dimensions, the CM10 uses an AICS-pattern magazine architecture that supports the SOCOM XL configuration while maintaining semi-automatic operation.

This 16-inch configuration combines a fast 1:10 twist .458 SOCOM barrel, adjustable gas system, adjustable buffer and modified MDT metal AICS magazine with Cobalt Kinetics Green Cerakote and Coyote B5 Systems furniture.

A Complete .458 SOCOM System

The CM10 was developed as more than an unconventional host for .458 SOCOM. The firearm, magazine and ammunition are designed to work together as a system.

The 458 SOCOM Semi Automatic Rifle uses a center-feed barrel extension and a lower receiver machined for AICS-pattern magazines. Chattahoochee Munitions modifies an MDT metal AICS magazine specifically for the extended cartridge length used by SOCOM XL ammunition.

That magazine architecture is paired with 458 SOCOM Semi Auto Ammo developed specifically around the feeding and operating requirements of the CM10.

The result is an integrated approach: firearm, magazine and ammunition developed around the same application.

This system-level approach distinguishes the 458 SOCOM Semi Automatic Rifle from configurations that simply adapt .458 SOCOM to an existing platform.

By combining extended cartridge length with center feeding, the 458 SOCOM Semi Automatic Rifle provides a purpose-built path for exceptionally long .458-caliber projectiles in a semi-automatic platform.

The 16-inch barrel also gives the 458 SOCOM Semi Automatic Rifle flexibility across subsonic and supersonic applications while retaining the fast 1:10 twist selected for heavy .458-caliber projectiles.

For shooters exploring the broader SOCOM XL concept, this 458 SOCOM Semi Automatic Rifle connects directly to the ammunition and magazine components developed around the CM10 platform.

The combination of adjustable gas, adjustable buffer and center-feed architecture gives the 458 SOCOM Semi Automatic Rifle a configurable operating system designed around the demands of the CM10 platform.

With its Cobalt Kinetics Green finish and Coyote furniture, this 458 SOCOM Semi Automatic Rifle pairs the distinctive CM10 appearance with the extended-length capability of the SOCOM XL system.

What SOCOM XL Means

The chamber in this rifle is .458 SOCOM. SOCOM XL does not describe a different chamber, different cartridge case or proprietary chamber specification.

SOCOM XL describes the ability to use .458 SOCOM ammunition at an extended cartridge overall length when the firearm and magazine architecture provide sufficient room.

This matters when working with exceptionally long .458-caliber projectiles. Conventional AR-15 magazine dimensions restrict cartridge overall length. To remain within that envelope, more of a long projectile must extend into the case.

The CM10 provides another option. Its modified AICS magazine architecture allows compatible ammunition to use additional cartridge overall length.

The chamber remains .458 SOCOM. The cartridge gets more room.

Modified AICS Magazine for SOCOM XL

A defining component of the 458 SOCOM Semi Automatic Rifle is its magazine system. The CM10 lower is machined around AICS-pattern magazines rather than conventional AR10 magazines.

For SOCOM XL applications, the rifle includes a 7-round modified MDT metal AICS magazine specifically configured by Chattahoochee Munitions for extended-length .458 SOCOM ammunition.

The center-feed magazine architecture works with the center-feed barrel extension and positions the cartridge along the centerline of the action.

CM10-Specific 650gr Semi-Auto Ammunition

Chattahoochee Munitions also offers a 650gr Maker REX load developed specifically for the CM10 semi-automatic platform. The current load uses a cartridge overall length of 2.790 inches.

Operating a semi-automatic firearm requires more than simply fitting the cartridge into the magazine. The ammunition must provide appropriate gas characteristics for the operating system. The CM10-specific load therefore uses a propellant configuration selected around semi-automatic cycling.

Specific propellant types, charge weights and other proprietary loading information are not published.

Pairing the 458 SOCOM Semi Automatic Rifle with ammunition developed for its operating system provides a defined path for customers interested in the extended-length SOCOM XL configuration.

16″ Fast-Twist .458 SOCOM Barrel

The CM10 uses a 16-inch 416R stainless steel barrel chambered in .458 SOCOM. Its fast 1:10 twist rate is particularly relevant when using exceptionally heavy .458-caliber projectiles.

• Chambering: .458 SOCOM
• Barrel Length: 16″
• Material: 416R Stainless Steel
• Rifling: 5R
• Twist Rate: 1:10
• Muzzle Threads: 11/16×24
• Gas Journal: .875″
• Gas System: Pistol Length
• Barrel Extension: Center Feed
• Finish: Black Cerakote

The 16-inch barrel provides a versatile configuration for both subsonic and supersonic .458 SOCOM ammunition. For more information about heavy-projectile applications, visit our guide to 458 SOCOM Subsonic.

Adjustable Gas and Buffer System

Large differences between ammunition and suppressor configurations can change the operating requirements of a semi-automatic firearm. The CM10 addresses this with adjustment at both the gas system and buffer.

A Superlative Arms .875″ Adjustable Gas Block is paired with a Melonite pistol-length gas tube.

At the rear of the operating system, an Odin Works Adjustable AR10 Buffer provides another point of adjustment.

Together, adjustable gas and buffer systems provide the 458 SOCOM Semi Automatic Rifle with tuning capability for different ammunition and suppressor configurations.

Billet CM10 Receiver Architecture

The CM10 receiver set is machined from 7075-T6 billet aluminum and uses DPMS Low Profile architecture. It maintains compatibility with 16 TPI barrel nuts, DPMS-pattern barrel extensions and compatible large-frame bolt carrier groups.

The design incorporates several CM10-specific features:

• AICS-pattern magazine well
• Center-feed magazine architecture
• Paddle magazine release forward of the trigger guard
• Integral trigger guard
• Weight-reduction machining on the upper and lower
• No forward assist
• Fire/Safe markings on both sides
• CM ambidextrous safety
• CM10 pivot and takedown pins

The upper receiver, lower receiver and handguard on this configuration receive Cobalt Kinetics Green Cerakote.

TriggerTech Duty Fire Control

The 458 SOCOM Semi Automatic Rifle uses a TriggerTech Duty Trigger. Customers can select among three 3.5-pound configurations:

• Single-Stage Flat
• Single-Stage Curved
• Two-Stage Flat

The lower is completed with a Coyote B5 Systems grip and CM ambidextrous safety.

CM10 Bolt Carrier Group

The CM10 bolt carrier group uses a Mil-Spec 9310 steel bolt with high-pressure testing, magnetic-particle inspection and shot-peening.

• Mil-Spec 9310 steel bolt
• HPT / proof tested
• MPI inspected
• Shot-peened
• Nitride bolt, carrier and gas key
• Hardened USGI-spec gas key
• Grade 8 gas-key fasteners
• Mil-Spec gas-key staking
• Tool-steel extractor
• T.E.A. extractor spring
• Black extractor insert
• Mil-Spec Crane O-ring

CM10 Warhammer Ambidextrous Charging Handle

A CM10 Warhammer ambidextrous charging handle provides charging access from either side of the rifle. Manufactured from 7075 aluminum, the charging handle was developed with Breek Arms.

15″ CM10 LWS Handguard

The 16-inch configuration uses a 15-inch CM10 LWS M-LOK handguard manufactured from 6061 aluminum and secured with a steel barrel nut.

• 15″ length
• 6061 aluminum construction
• Steel barrel nut
• Full-length Picatinny top rail
• M-LOK attachment surfaces
• QD sling points at 3 and 9 o’clock
• Cobalt Kinetics Green Cerakote
• Coyote B5 Systems rail covers

B5 Systems Furniture

Coyote B5 Systems furniture contrasts with the Cobalt Kinetics Green receiver and handguard. The rifle uses a B5 Systems Bravo Stock, B5 grip and matching rail covers.

The stock is mounted to a CM Mil-Spec buffer tube with a QD end plate and the adjustable Odin Works buffer.

CM10 458 SOCOM Semi Automatic Rifle Specifications

• Platform: CM10 Large-Frame Semi-Automatic
• Chambering: .458 SOCOM
• SOCOM XL Capability: Yes
• Barrel: 16″ 416R Stainless Steel
• Twist: 1:10
• Rifling: 5R
• Muzzle Threads: 11/16×24
• Gas System: Pistol Length / Adjustable
• Gas Block: Superlative Arms .875″ Adjustable
• Magazine: 7-Round Modified MDT Metal AICS Magazine for SOCOM XL
• Feed Architecture: Center Feed
• Receiver: 7075-T6 Billet Aluminum
• Handguard: 15″ CM10 LWS M-LOK
• Trigger: TriggerTech Duty, Selectable Configuration
• Buffer: Odin Works Adjustable AR10 Buffer
• Stock: B5 Systems Bravo
• Furniture: Coyote B5 Systems
• Finish: Cobalt Kinetics Green Cerakote

Frequently Asked Questions

Is SOCOM XL a different chamber from .458 SOCOM?
No. The CM10 is chambered in .458 SOCOM. SOCOM XL describes the extended cartridge overall-length capability provided by the compatible firearm and magazine architecture.

Why does the CM10 use an AICS magazine?
The AICS-pattern architecture provides the cartridge-length space required for the extended SOCOM XL configuration. The CM10 uses a purpose-modified MDT metal AICS magazine configured specifically for extended-length .458 SOCOM ammunition.

Is this an AR-15-based 458 SOCOM?

No. Although .458 SOCOM is traditionally associated with the AR-15, the CM10 is a purpose-built large-frame platform using an AICS-pattern center-feed magazine architecture.

Does Chattahoochee Munitions make semi-auto ammunition for the CM10?
Yes. The 650gr 458 SOCOM Semi Auto Ammo uses a 2.790-inch OAL and a propellant configuration developed specifically around CM10 semi-automatic operation.

Can the CM10 be tuned for different configurations?
Yes. The CM10 incorporates both an adjustable gas block and adjustable buffer, providing two points of operating-system adjustment for different ammunition and suppressor configurations.

Where can I see the complete 458 SOCOM XL system?
Visit Terminal 458 to explore CM10 and CM7S firearms, SOCOM XL ammunition, magazines and supporting technical information.

Limited Lifetime Warranty

The 458 SOCOM Semi Automatic Rifle is backed by the Chattahoochee Munitions Limited Lifetime Warranty for the original purchaser, subject to applicable warranty terms and original-configuration requirements.

The CM10 brings together a fast-twist .458 SOCOM barrel, center-feed AICS magazine architecture, SOCOM XL capability and an adjustable semi-automatic operating system in one purpose-built platform. Explore the broader .458 SOCOM ecosystem at Terminal 458.