CM7S .458 SOCOM 16″ Rifle

Purpose-Built 458 Bolt Action Rifle

The Chattahoochee Munitions CM7S .458 SOCOM 16″ Rifle is a purpose-built 458 Bolt Action Rifle designed around the capabilities of exceptionally heavy .458-caliber projectiles and the extended cartridge overall length available through the SOCOM XL configuration.

Built on the CM7S short-action platform and chambered in .458 SOCOM, this rifle can take advantage of cartridge overall lengths beyond the traditional AR-15 magazine envelope. This provides greater flexibility when loading long, heavy .458-caliber projectiles for specialized subsonic and suppressed applications.

At the heart of this 458 Bolt Action Rifle is a 16-inch Mos-Tek barrel with a fast 1:10 twist rate, providing the rotational stability required for exceptionally heavy projectiles.

The complete CM7S feeds from genuine MDT metal AICS-pattern magazines modified by Chattahoochee Munitions specifically for the extended-length .458 SOCOM ammunition used in the SOCOM XL configuration.

For shooters looking beyond a conventional large-bore rifle, the CM7S combines heavy-projectile capability with the accuracy, simplicity and versatility of a purpose-built bolt-action platform.

Explore the complete Chattahoochee Munitions .458 SOCOM ecosystem—including bolt-action and semi-automatic firearms, ammunition, magazines and technical information—at Terminal 458.

Why Choose a 458 Bolt Action Rifle?

.458 SOCOM is commonly associated with the AR-15 platform. While that architecture provides a proven large-bore semi-automatic option, the magazine system 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 using the CM7S short-action platform and an AICS-pattern magazine architecture, this 458 Bolt Action Rifle provides additional usable cartridge overall length for long, heavy .458-caliber projectiles.

Instead of designing the rifle around the dimensional restrictions of an AR-15 magazine, Chattahoochee Munitions uses the additional room available in the CM7S platform to support extended-length .458 SOCOM ammunition.

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

This gives the 458 Bolt Action Rifle additional flexibility when using projectile designs that would otherwise require deeper seating to remain within traditional AR-15 magazine dimensions.

16″ Mos-Tek Barrel with 1:10 Twist

The CM7S uses a Mos-Tek 16-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 length and weight increase. The 1:10 twist used in this 458 Bolt Action Rifle supports the exceptionally long and heavy projectiles associated with the SOCOM XL application.

The 16-inch barrel provides a practical balance between barrel length, handling and overall firearm size while retaining the heavy-projectile capabilities that define the platform.

Barrel Specifications

• Chambering: .458 SOCOM
• Manufacturer: Mos-Tek
• Length: 16″
• 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

TriggerTech Primary Trigger

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

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

Chattahoochee Munitions sets the trigger at approximately 1.5 pounds for this configuration, providing a clean and predictable break suited to the accuracy-focused CM7S platform.

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 limited to the traditional AR-15 magazine envelope.

That additional usable length provides greater seating flexibility for exceptionally long and heavy .458-caliber projectiles. The same .458 SOCOM chamber and cartridge case are retained.

For shooters interested in a 458 Bolt Action Rifle specifically because of its heavy-projectile potential, 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 cartridge clearance and feeding configuration needed to accommodate extended-length .458 SOCOM ammunition in complete Chattahoochee Munitions SOCOM XL firearms.

This magazine architecture allows the 458 Bolt Action Rifle to take advantage of the additional cartridge overall length available in the CM7S short-action platform.

Chattahoochee Munitions also uses this modified MDT magazine architecture in the CM10 large-frame semi-automatic .458 SOCOM platform, allowing both branches of the Terminal 458 ecosystem to support extended-length SOCOM XL ammunition configured for their respective operating systems.

Designed Around Heavy Subsonic .458 SOCOM

The CM7S platform is particularly well suited to suppressed and subsonic applications.

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.

Combine that characteristic with exceptionally heavy .458-caliber projectiles, a fast 1:10 twist barrel and extended cartridge overall-length capability, and the CM7S becomes a specialized platform for heavy subsonic .458 SOCOM.

The result is a 458 Bolt Action Rifle engineered around the characteristics that make heavy subsonic cartridges distinctive.

For more technical information about heavy subsonic .458 SOCOM, 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.

This ammunition 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.

The load 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.

For shooters focused on heavy-projectile and suppressed applications, the 458 Bolt Action Rifle combines the CM7S short-action architecture with a fast-twist barrel and the extended-OAL capability of the SOCOM XL configuration.

Key Features

• Chattahoochee Munitions CM7S bolt-action platform
• Chambered in .458 SOCOM
• SOCOM XL extended cartridge overall-length capability
• 16-inch Mos-Tek 416R stainless barrel
• 5R rifling
• Fast 1:10 twist rate
• 11/16×24 muzzle threads
• 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
• Well suited to suppressed and subsonic 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: 16″
• Barrel Material: 416R Stainless Steel
• Rifling: 5R
• Twist Rate: 1:10
• Muzzle Threads: 11/16×24
• 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
• Weight: 6 lb 6 oz
• Overall Length: 23.875″ – 31.00″
• Length of Pull: 6.0″ – 13.5″

Who Is the CM7S For?

The CM7S is designed for shooters specifically interested in the capabilities of large-diameter, exceptionally heavy projectiles and suppressed shooting.

If you’re looking for a 458 Bolt Action 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 fast-twist Mos-Tek barrel and TriggerTech Primary trigger to the modified MDT magazine system, the rifle is built around extended-length .458 SOCOM capability rather than treating SOCOM XL as an afterthought.

FAQ

What is a 458 Bolt Action Rifle?

A 458 Bolt Action Rifle is a bolt-operated rifle built around a .458-caliber cartridge. The CM7S is chambered in .458 SOCOM and configured to take advantage of the extended cartridge overall length associated with the SOCOM XL system.

Is the CM7S chambered in .458 SOCOM XL?

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

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 how compatible firearms, magazines and ammunition use additional cartridge overall length; it does not describe a different chamber.

What is the barrel length?

The CM7S uses a 16-inch Mos-Tek barrel.

What is the barrel twist rate?

The barrel uses a 1:10 twist rate selected to support the long, exceptionally heavy projectiles used in the SOCOM XL application.

What trigger does the CM7S use?

The rifle comes standard with a TriggerTech Primary Remington 700 trigger set at approximately 1.5 pounds. Customers can select either a 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 combination of the CM7S bolt-action platform, exceptionally heavy .458-caliber projectile capability, fast 1:10 twist barrel and extended-OAL SOCOM XL configuration makes this 458 Bolt Action Rifle particularly well suited to suppressed and subsonic applications.

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

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