CM10 458 SOCOM Short Barrel Rifle – 12.5″ Cobalt Kinetics Green
The Chattahoochee Munitions CM10 458 SOCOM Short Barrel Rifle packages the large-frame CM10 platform around a compact 12.5-inch .458 SOCOM barrel. Its fast 1:10 twist, 11.5-inch handguard, center-feed AICS magazine architecture and adjustable operating system create a purpose-built semi-automatic platform for heavy .458-caliber ammunition.
Finished in Cobalt Kinetics Green Cerakote with Coyote B5 Systems furniture, this configuration combines the compact dimensions of a short-barreled rifle with the SOCOM XL capability of the CM10 platform. The result is a firearm, magazine and ammunition system designed around heavy and exceptionally long .458-caliber projectiles.
Compact 12.5″ .458 SOCOM Platform
The 458 SOCOM Short Barrel Rifle takes a different approach from the conventional AR-15 implementation of .458 SOCOM. Rather than building around AR-15 magazine dimensions, the CM10 uses a purpose-built large-frame receiver set with an AICS-pattern magazine well and center-feed architecture.
The 12.5-inch barrel and 11.5-inch handguard reduce host length compared with the 16-inch CM10 while retaining the platform’s fast twist, adjustable gas system, adjustable buffer and extended cartridge-length capability.
Although “short barrel rifle” is a commonly used search phrase, the proper classification of this stocked 12.5-inch configuration is a short-barreled rifle (SBR).
12.5″ Fast-Twist .458 SOCOM Barrel
At the center of the 458 SOCOM Short Barrel Rifle is a 12.5-inch barrel manufactured from 416R stainless steel. It uses 5R rifling and a fast 1:10 twist to support exceptionally heavy .458-caliber projectiles.
- Chambering: .458 SOCOM
- Barrel Length: 12.5″
- 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
For more information about heavy-projectile and suppressed applications, see our 458 SOCOM Subsonic guide.
SOCOM XL Capability Without a Different Chamber
The CM10 is chambered in .458 SOCOM. SOCOM XL is not another chambering, and it does not require a different .458 SOCOM cartridge case.
SOCOM XL instead describes the ability to use additional cartridge overall length provided by a compatible firearm and magazine system. That additional space becomes increasingly useful as .458-caliber projectiles become longer and heavier.
Conventional AR-15 magazine dimensions limit cartridge overall length. With an exceptionally long projectile, that restriction requires more of the projectile to occupy space inside the cartridge case.
The CM10’s AICS-based architecture provides additional usable cartridge length, allowing compatible projectiles to be seated farther out.
The chamber doesn’t get longer. The cartridge gets more room.
The 458 SOCOM Short Barrel Rifle combines this SOCOM XL capability with a compact 12.5-inch semi-automatic host.
Modified MDT AICS Magazine
The CM10 lower receiver is machined for AICS-pattern magazines rather than conventional AR10 magazines. SOCOM XL configurations use a 7-round modified MDT metal AICS magazine specifically configured by Chattahoochee Munitions for extended-length .458 SOCOM ammunition.
The magazine presents cartridges along the centerline of the firearm and works with the CM10 center-feed barrel extension. A paddle-style magazine release is located forward of the trigger guard.
This magazine architecture gives the 458 SOCOM Short Barrel Rifle the cartridge-length space required for SOCOM XL while maintaining the standard .458 SOCOM chamber.
650gr Maker REX Semi-Auto Ammunition
Chattahoochee Munitions offers 458 SOCOM Semi Auto Ammo developed specifically around the feeding and operating requirements of the CM10.
The current load uses a 650gr Maker REX solid-copper expanding projectile with factory-new Starline .458 SOCOM brass. It is loaded to a 2.790-inch overall length and uses a propellant configuration selected specifically to provide the gas required for semi-automatic cycling in the CM10.
Propellant type, charge weight and other proprietary loading information are not published.
This is a separate ammunition configuration from the 2.802-inch bolt-action load. The semi-auto ammunition, modified magazine and CM10 operating system work together as an integrated SOCOM XL solution.
Adjustable Gas and Buffer System
A compact big-bore semi-automatic platform can experience different operating requirements as ammunition and suppressor configurations change. The CM10 provides adjustment at both ends of the operating system.
A Superlative Arms .875″ Adjustable Gas Block works with a Melonite pistol-length gas tube. At the rear, an Odin Works Adjustable AR10 Buffer provides an additional point of adjustment.
Together, these components allow the 458 SOCOM Short Barrel Rifle operating system to be tuned around different ammunition and suppressor configurations.
7075-T6 Billet CM10 Receiver Set
The CM10 upper and lower receivers are machined from 7075-T6 billet aluminum around DPMS Low Profile architecture. The platform retains compatibility with 16 TPI barrel nuts, DPMS-pattern barrel extensions and compatible large-frame bolt carrier groups while incorporating the CM10-specific AICS magazine system.
- AICS-pattern magazine well
- Center-feed architecture
- Paddle magazine release forward of the trigger guard
- Integral trigger guard
- Weight-reduction machining
- No forward assist
- Fire/Safe markings on both sides
- CM ambidextrous safety
- CM10 pivot and takedown pins
The upper receiver, lower receiver and handguard receive Cobalt Kinetics Green Cerakote. Coyote B5 Systems furniture and rail covers provide the contrasting furniture package.
TriggerTech Duty Trigger
The 458 SOCOM Short Barrel Rifle is equipped with a TriggerTech Duty Trigger. Customers can select from three 3.5-pound configurations:
- Single-Stage Flat
- Single-Stage Curved
- Two-Stage Flat
A CM ambidextrous safety completes the fire-control interface.
9310 Steel Bolt and CM10 Bolt Carrier Group
The CM10 bolt carrier group uses a 9310 steel bolt that is high-pressure tested, magnetic-particle inspected and shot-peened.
- 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
The CM10 Warhammer ambidextrous charging handle is manufactured from 7075 aluminum and provides charging access from either side of the firearm. It was developed with Breek Arms.
11.5″ CM10 LWS M-LOK Handguard
The 458 SOCOM Short Barrel Rifle uses an 11.5-inch CM10 LWS M-LOK handguard surrounding the 12.5-inch barrel. The handguard is manufactured from 6061 aluminum and secured with a steel barrel nut.
- Handguard Length: 11.5″
- Material: 6061 Aluminum
- 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
Coyote B5 Systems Furniture
The Cobalt Kinetics Green finish is paired with Coyote B5 Systems furniture. The configuration includes a B5 Systems Bravo Stock, B5 grip and Coyote rail covers.
The stock is mounted to a CM Mil-Spec buffer tube with a QD end plate and the Odin Works Adjustable AR10 Buffer.
A Compact Host for Suppressed Applications
Compared with the 16-inch CM10, the 12.5-inch barrel reduces the length of the host firearm by 3.5 inches before a suppressor or other muzzle-mounted component is installed. That reduction becomes particularly useful when managing the overall length of a suppressed system.
The fast 1:10 twist supports exceptionally heavy projectiles, while adjustable gas and buffer systems provide the ability to tune semi-automatic operation around the selected configuration.
For users seeking a compact large-frame .458 SOCOM platform, the 458 SOCOM Short Barrel Rifle brings together the 12.5-inch barrel, SOCOM XL cartridge-length capability and the CM10 semi-automatic operating system.
The 12.5-inch configuration makes the 458 SOCOM Short Barrel Rifle a compact alternative to the 16-inch CM10 while retaining the same center-feed approach and SOCOM XL cartridge-length capability.
With its modified AICS magazine, the 458 SOCOM Short Barrel Rifle provides additional usable cartridge length for compatible heavy .458-caliber projectiles without changing the standard .458 SOCOM chamber.
The adjustable gas system and adjustable buffer give the 458 SOCOM Short Barrel Rifle two points of operating-system adjustment when ammunition or suppressor configurations change.
For shooters building around heavy subsonic ammunition, the 458 SOCOM Short Barrel Rifle combines a fast 1:10 twist, compact 12.5-inch barrel and CM10 semi-automatic architecture in one integrated platform.
CM10 458 SOCOM Short Barrel Rifle Specifications
- Platform: CM10 Large-Frame Semi-Automatic SBR
- Chambering: .458 SOCOM
- SOCOM XL Capability: Yes
- Barrel: 12.5″ 416R Stainless Steel
- Twist: 1:10
- Rifling: 5R
- Muzzle Threads: 11/16×24
- Gas Journal: .875″
- Gas System: Adjustable / Pistol Length
- 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: 11.5″ CM10 LWS M-LOK
- Trigger: TriggerTech Duty, Selectable Configuration
- Bolt: 9310 Steel
- Buffer: Odin Works Adjustable AR10 Buffer
- Stock: B5 Systems Bravo
- Furniture: Coyote B5 Systems
- Finish: Cobalt Kinetics Green Cerakote
Frequently Asked Questions
Is “short barrel rifle” the proper term for this firearm?
The proper classification is Short-Barreled Rifle (SBR). “Short barrel rifle” is also commonly used when people search for this type of firearm, but short-barreled rifle is the technically correct terminology.
Is the CM10 chambered in .458 SOCOM XL?
No. The chamber is .458 SOCOM. SOCOM XL describes the additional cartridge overall-length capability provided by the compatible firearm and magazine architecture. It is not a separate chamber.
Why does the CM10 use an AICS magazine?
The AICS-based architecture provides additional usable cartridge length for extended-length .458 SOCOM ammunition while allowing cartridges to feed along the centerline of the firearm.
What magazine does this rifle use?
The CM10 uses a 7-round modified MDT metal AICS magazine specifically configured by Chattahoochee Munitions for SOCOM XL ammunition.
Is there ammunition specifically developed for the semi-auto CM10?
Yes. Chattahoochee Munitions offers 458 SOCOM Semi Auto Ammo using a 650gr Maker REX projectile at a 2.790-inch OAL with a propellant configuration developed around CM10 cycling requirements.
Can the CM10 be tuned for suppressed operation?
The CM10 incorporates an adjustable gas block and adjustable buffer, providing two points of adjustment for different ammunition and suppressor configurations.
Where can I learn more about the CM .458 SOCOM system?
Visit Terminal 458 for CM10 and CM7S firearms, ammunition, SOCOM XL magazines and supporting technical information.
Limited Lifetime Warranty
The 458 SOCOM Short Barrel 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 combines a compact 12.5-inch fast-twist barrel, 11.5-inch handguard, center-feed AICS magazine architecture, SOCOM XL capability and adjustable semi-automatic operating system in a purpose-built short-barreled rifle. Explore the complete .458 SOCOM ecosystem at Terminal 458.
Reviews
There are no reviews yet.