CM7S .458 SOCOM 12.5″ SBR / Pistol

Purpose-Built 458 SOCOM Short Barreled Rifle

The Chattahoochee Munitions CM7S .458 SOCOM 12.5″ is a compact, purpose-built 458 SOCOM Short Barreled Rifle designed around exceptionally heavy .458-caliber projectiles, suppressed shooting and the extended cartridge overall length available through the SOCOM XL configuration. It is also available in a pistol configuration with a Tailhook brace in place of the buttstock.

Built on the CM7S short-action bolt-action platform and chambered in .458 SOCOM, this firearm can take advantage of cartridge overall lengths beyond the traditional AR-15 magazine envelope. That additional room provides greater flexibility when loading long, heavy .458-caliber projectiles.

At the heart of this 458 SOCOM Short Barreled Rifle is a compact 12.5-inch Mos-Tek barrel with a fast 1:10 twist rate, providing the rotational stability required for exceptionally heavy projectiles.

The 12.5-inch barrel and compact CM7S platform make this configuration particularly well suited to suppressed applications where minimizing overall system length is a priority.

Explore the complete Chattahoochee Munitions .458 SOCOM ecosystem—including CM7S and CM10 firearms, ammunition, magazines and technical information—at Terminal 458.

Why Choose a 458 SOCOM Short Barreled Rifle?

.458 SOCOM is commonly associated with the AR-15 platform. While that architecture provides a proven large-bore option, the AR-15 magazine also establishes a practical limit on cartridge overall length.

The CM7S SOCOM XL configuration moves beyond that magazine-length constraint without changing the .458 SOCOM chamber.

By utilizing the CM7S short-action platform and AICS-pattern magazine architecture, this 458 SOCOM Short Barreled Rifle provides additional usable cartridge overall length for long, heavy .458-caliber projectiles.

The 12.5-inch barrel creates an exceptionally compact large-bore bolt-action platform. For shooters intending to add a suppressor, reducing barrel length helps control the overall length of the complete suppressed system.

The chamber doesn’t get longer. The cartridge gets more room.

The 458 SOCOM Short Barreled Rifle combines that extended-OAL capability with a compact bolt-action format built around heavy .458-caliber projectiles.

12.5″ Mos-Tek Barrel with 1:10 Twist

The CM7S uses a Mos-Tek 12.5-inch .458 SOCOM barrel manufactured from 416R stainless steel with 5R rifling and a fast 1:10 twist rate.

Projectile stabilization becomes increasingly important as projectile weight and length increase. The 1:10 twist used in this 458 SOCOM Short Barreled Rifle supports the exceptionally long and heavy projectiles associated with the SOCOM XL application.

The 12.5-inch barrel provides excellent maneuverability and helps keep the overall platform compact, particularly when paired with a suppressor.

Barrel Specifications

• Chambering: .458 SOCOM
• Manufacturer: Mos-Tek
• Length: 12.5″
• Material: 416R Stainless Steel
• Rifling: 5R
• Twist Rate: 1:10
• Crown: Shouldered Crown
• Muzzle Threads: 11/16×24
• Barrel System: Remage
• Finish: E100 Blackout Cerakote

Short Barreled Rifle or Pistol Configuration

The CM7S .458 SOCOM 12.5″ is available in your choice of Short Barreled Rifle (SBR) or pistol configuration.

The Short Barreled Rifle configuration is equipped with a buttstock.

The pistol configuration substitutes a Tailhook pistol brace for the buttstock.

Both configurations retain the same purpose-built CM7S action, 12.5-inch 1:10 twist barrel, TriggerTech Primary trigger and modified MDT metal magazine system.

This allows customers to select the configuration that best fits their intended use while retaining the core heavy-projectile and extended-OAL capabilities of the CM7S platform.

TriggerTech Primary Trigger

The CM7S comes standard with a TriggerTech Primary Remington 700 trigger.

The TriggerTech Primary is adjustable from 1.5 to 4.0 pounds and uses TriggerTech’s Frictionless Release Technology. Customers can select either a flat or curved trigger shoe.

Chattahoochee Munitions sets the trigger at approximately 1.5 pounds for this configuration.

What 458 SOCOM XL Means

SOCOM XL does not describe a different chamber. The CM7S remains chambered in .458 SOCOM.

SOCOM XL describes the extended cartridge overall-length capability made possible when .458 SOCOM is used in compatible firearm and magazine systems that are not confined to the traditional AR-15 magazine envelope.

That additional usable length provides greater seating flexibility when working with exceptionally long and heavy .458-caliber projectiles while retaining the same .458 SOCOM chamber and cartridge case.

For shooters considering a 458 SOCOM Short Barreled Rifle specifically for heavy-projectile and suppressed applications, the CM7S provides a platform configured around those capabilities from the beginning.

Modified MDT Metal Magazine System

The complete CM7S uses a genuine MDT metal AICS-pattern magazine modified by Chattahoochee Munitions for the SOCOM XL application.

The modified magazine provides the usable cartridge length and feeding configuration required to accommodate extended-length .458 SOCOM ammunition in complete Chattahoochee Munitions SOCOM XL firearms.

This magazine system allows the 458 SOCOM Short Barreled Rifle to take advantage of the additional cartridge overall length available in the CM7S short-action platform.

The complete 458 SOCOM Short Barreled Rifle also integrates the modified MDT magazine system that enables the extended cartridge overall length used in the SOCOM XL configuration.

Chattahoochee Munitions also uses this modified MDT magazine architecture in the CM10 large-frame semi-automatic .458 SOCOM platform.

Designed Around Heavy Subsonic .458 SOCOM

Suppressed shooting is one of the areas where the compact CM7S configuration becomes particularly useful.

Unlike a semi-automatic firearm, a bolt-action rifle does not depend on ammunition producing sufficient gas to cycle the action. This allows bolt-action ammunition to be developed around the projectile and intended ballistic application without simultaneously satisfying semi-automatic cycling requirements.

The 12.5-inch barrel also helps control the overall length of the firearm once a suppressor is installed.

Combine that compact configuration with exceptionally heavy .458-caliber projectiles, a fast 1:10 twist barrel and extended cartridge overall-length capability, and the result is a specialized heavy-subsonic platform.

For suppressed applications, the 458 SOCOM Short Barreled Rifle keeps barrel length compact while preserving the fast-twist performance needed for exceptionally heavy projectiles.

The 458 SOCOM Short Barreled Rifle is therefore well suited to shooters prioritizing a compact suppressed bolt-action system.

For more technical information, see the Chattahoochee Munitions 458 SOCOM Subsonic guide.

650gr Maker REX Bolt-Action Ammunition

Chattahoochee Munitions offers 458 SOCOM Subsonic Ammo developed specifically for the bolt-action side of the Terminal 458 ecosystem.

The load uses a 650gr Maker REX solid-copper expanding projectile loaded in factory-new Starline .458 SOCOM brass at an overall cartridge length of 2.802 inches.

This ammunition is intended for the CM7S bolt-action platform and other appropriately configured bolt-action firearms. It is separate from the ammunition configuration developed for the CM10 semi-automatic platform.

Key Features

• Chattahoochee Munitions CM7S bolt-action platform
• Chambered in .458 SOCOM
• SOCOM XL extended cartridge overall-length capability
• 12.5-inch Mos-Tek 416R stainless barrel
• 5R rifling
• Fast 1:10 twist rate
• 11/16×24 muzzle threads
• Choice of Short Barreled Rifle or pistol configuration
• Buttstock on Short Barreled Rifle configuration
• Tailhook brace on pistol configuration
• TriggerTech Primary Remington 700 trigger
• Flat or curved trigger shoe option
• Trigger set at approximately 1.5 lb
• Short-action architecture
• Designed around exceptionally heavy .458-caliber projectiles
• Genuine MDT metal AICS-pattern magazine modified by Chattahoochee Munitions
• Extended cartridge overall-length capability
• Compact configuration for suppressed applications
• Manufactured and assembled by Chattahoochee Munitions

Specifications

• Chambering: .458 SOCOM
• SOCOM XL Capability: Extended-OAL Configuration
• Platform: CM7S Bolt Action
• Barrel Manufacturer: Mos-Tek
• Barrel Length: 12.5″
• Barrel Material: 416R Stainless Steel
• Rifling: 5R
• Twist Rate: 1:10
• Muzzle Threads: 11/16×24
• Configuration: Short Barreled Rifle (SBR) or Pistol
• SBR Configuration: Buttstock
• Pistol Configuration: Tailhook Brace
• Trigger: TriggerTech Primary Remington 700
• Trigger Shoe: Flat or Curved
• Trigger Pull: Set at approximately 1.5 lb
• Magazine: Modified MDT Metal AICS-Pattern Magazine

Who Is the CM7S 12.5″ For?

The CM7S is designed for shooters specifically interested in large-diameter, exceptionally heavy projectiles in a compact bolt-action platform.

If you’re looking for a 458 SOCOM Short Barreled Rifle that moves beyond the dimensional restrictions imposed by an AR-15 magazine, the CM7S provides a platform configured specifically around that objective.

From the compact 12.5-inch fast-twist Mos-Tek barrel and TriggerTech Primary trigger to the modified MDT magazine system, the firearm is built around extended-length .458 SOCOM capability rather than treating SOCOM XL as a separate chambering.

FAQ

What is a 458 SOCOM Short Barreled Rifle?

A 458 SOCOM Short Barreled Rifle is a rifle chambered in .458 SOCOM with a barrel shorter than 16 inches. The CM7S uses a 12.5-inch barrel and is configured to support the extended cartridge overall length associated with SOCOM XL.

Is the CM7S chambered in .458 SOCOM XL?

No separate .458 SOCOM XL chamber is used. The CM7S is chambered in .458 SOCOM. SOCOM XL refers to the extended cartridge overall-length capability provided by compatible Chattahoochee Munitions firearm and magazine configurations.

Can I order the CM7S 12.5″ as a pistol instead?

Yes. The CM7S .458 SOCOM 12.5″ can be selected as either a Short Barreled Rifle with a buttstock or a pistol equipped with a Tailhook brace.

What is .458 SOCOM XL?

.458 SOCOM XL uses additional cartridge overall length available outside the traditional AR-15 magazine envelope. This provides greater seating flexibility for long, heavy .458-caliber projectiles while retaining the .458 SOCOM chamber and cartridge case.

Is .458 SOCOM XL the same chambering as .458 SOCOM?

Yes. The chamber remains .458 SOCOM. SOCOM XL describes extended cartridge overall-length capability; it does not describe a different chamber.

What is the barrel length and twist rate?

The CM7S features a 12.5-inch Mos-Tek barrel with a 1:10 twist rate. The fast twist supports the exceptionally heavy projectiles used in the SOCOM XL application.

What trigger does the CM7S use?

The CM7S comes standard with a TriggerTech Primary Remington 700 trigger set at approximately 1.5 pounds, with a choice of flat or curved trigger shoe.

What magazine does the CM7S use?

The complete CM7S SOCOM XL firearm uses a genuine MDT metal AICS-pattern magazine modified by Chattahoochee Munitions specifically for the extended-length .458 SOCOM application.

Is the CM7S designed for suppressed shooting?

Yes. The compact 12.5-inch barrel, bolt-action operating system, fast 1:10 twist and ability to utilize exceptionally heavy .458-caliber projectiles make the CM7S particularly well suited to suppressed and subsonic applications.

Is the Short Barreled Rifle configuration subject to NFA requirements?

Yes. The configuration equipped with a buttstock and 12.5-inch barrel is a Short Barreled Rifle (SBR) and is subject to applicable NFA requirements. A pistol configuration equipped with a Tailhook brace is also available. Customers are responsible for compliance with applicable federal, state and local laws.

Where can I find other .458 SOCOM firearms, ammunition and components?

Visit Terminal 458 for Chattahoochee Munitions CM7S and CM10 firearms, ammunition, the SOCOM XL magazine and supporting technical information.