CM7S 458 SOCOM XL Barreled Action 16″

CM7S 458 SOCOM Barreled Action – 16″

The Chattahoochee Munitions 458 SOCOM Barreled Action combines the CM7S Remington 700-footprint bolt action with a 16-inch Mos-Tek .458 SOCOM barrel, providing the core assembly for a custom bolt-action .458 SOCOM build. It allows the builder to select the stock or chassis, trigger, magazine system and other components appropriate for the finished firearm.

The CM7S is chambered in .458 SOCOM. SOCOM XL is not a different chamber or cartridge case. In complete Chattahoochee Munitions firearms, SOCOM XL takes advantage of additional usable cartridge overall length to accommodate exceptionally long .458-caliber projectiles. Customers completing their own firearm around a CM7S barreled action are responsible for selecting and validating the components necessary for their intended cartridge configuration.

Purpose-Built Bolt-Action .458 SOCOM Platform

The 458 SOCOM Barreled Action approaches the cartridge differently from its traditional AR-15 application. Rather than building around the dimensions and operating requirements of a conventional AR-15 platform, the CM7S uses a Remington 700-footprint bolt action as the foundation for a custom .458 SOCOM rifle.

The bolt-action operating system is particularly useful with heavy subsonic ammunition because firearm operation does not require the ammunition to generate the gas necessary to cycle a semi-automatic action. This allows the CM7S to accommodate ammunition developed specifically around bolt-action use.

The 16-inch configuration provides a versatile foundation for a complete custom rifle while retaining the fast 1:10 twist used throughout Chattahoochee Munitions’ .458 SOCOM system.

16″ Mos-Tek .458 SOCOM Barrel

The barrel on the 458 SOCOM Barreled Action is manufactured by Mos-Tek from 416R stainless steel. The 16-inch barrel uses 5R rifling and a fast 1:10 twist selected to support the exceptionally heavy .458-caliber projectiles used in many subsonic applications.

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

SOCOM XL and Extended Cartridge Length

The CM7S 458 SOCOM Barreled Action remains chambered in standard .458 SOCOM. The SOCOM XL designation used by Chattahoochee Munitions describes an extended cartridge overall-length configuration; it does not describe a different chamber or cartridge case.

Projectile length becomes increasingly important with very heavy .458-caliber bullets. When cartridge overall length is constrained by a conventional AR-15 magazine, more of a long projectile must extend into the cartridge case. Providing additional usable overall length allows compatible projectiles to be seated farther out.

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

In complete CM SOCOM XL firearms, Chattahoochee Munitions integrates the firearm, magazine and ammunition around this extended-length concept. A customer-completed barreled-action build introduces additional component and dimensional variables that are outside CM’s control.

For an overview of the complete Chattahoochee Munitions .458 SOCOM ecosystem, visit Terminal 458.

SOCOM XL and Magazine Compatibility

The 458 SOCOM Barreled Action is sold as a barreled action. A magazine is not included. The customer completing the firearm is responsible for selecting the chassis or stock, magazine system and other components used in the finished build.

Complete Chattahoochee Munitions CM7S SOCOM XL firearms use a modified MDT metal AICS magazine configured by CM for extended-length .458 SOCOM ammunition. That magazine is part of the complete CM firearm system and is fitted and validated in that context.

Chattahoochee Munitions guarantees the function of its modified SOCOM XL magazine only when used as part of a complete Chattahoochee Munitions firearm. Magazine fit, magazine positioning, chassis selection and other components in a customer-completed build can affect feeding and function.

Customers building around a CM7S barreled action are therefore responsible for selecting and validating the magazine and related components used in their completed firearm.

CM7S Remington 700-Footprint Action

At the center of the 458 SOCOM Barreled Action is the CM7S action. Its Remington 700 footprint provides compatibility with many stocks, chassis systems and triggers designed around the R700 pattern while incorporating Chattahoochee Munitions’ own action architecture.

• Footprint: Remington 700
• Action Material: Steel
• Bolt: One-piece .718″ bolt
• Locking System: 3-lug
• Bolt Throw: 60°
• Extractor: M16 style
• Raceways: Wire EDM
• Scope Rail: Pinned 20 MOA Picatinny
• Recoil Lug: Integrated
• Firing Pin: .062″
• Barrel Thread: 1-1/16″-16
• Bolt Stop: Side mounted
• Bolt: Spiral fluted with oversized bolt knob
• Finish: Full PVD
• Action Weight: 25 oz
• Trigger Compatibility: Remington 700 pattern

The CM7S also incorporates a large ejection port, weight-reduction machining and tool-less fire-control removal.

Built for Heavy Subsonic .458 SOCOM

One of the primary applications for the CM7S 458 SOCOM Barreled Action is the use of exceptionally heavy subsonic projectiles. The bolt-action operating system does not depend on ammunition generating sufficient gas volume and pressure to operate a semi-automatic action.

This allows bolt-action ammunition to be developed around the projectile and intended ballistic application without simultaneously having to satisfy the cycling requirements of a gas-operated firearm.

For a deeper look at projectile weight, subsonic operation and the Chattahoochee Munitions approach to the cartridge, see our 458 SOCOM Subsonic technical 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 system.

The load uses a 650gr Maker REX solid-copper expanding projectile in factory-new Starline .458 SOCOM brass. Cartridge overall length is 2.802 inches. In complete CM7S SOCOM XL firearms, the firearm and magazine system are configured to accommodate this extended-length ammunition.

This ammunition is specifically configured for bolt-action use. It is not intended for conventional AR-15 magazines, mini actions or the CM10 semi-automatic platform. Chattahoochee Munitions offers a separate semi-auto load developed around the operating requirements of the CM10.

Customers completing their own firearm from a barreled action are responsible for verifying that the finished firearm, magazine system and component configuration are compatible with the ammunition they intend to use.

Subsonic and Supersonic Capability

The 458 SOCOM Barreled Action is not limited to subsonic ammunition. The standard .458 SOCOM chamber allows the platform to use compatible ammunition appropriate to the completed firearm and its configuration.

The 1:10 twist is particularly relevant to the exceptionally heavy projectiles used in the Terminal 458 subsonic system, while the 16-inch barrel provides a versatile foundation for builders who intend to use the rifle across more than one ammunition configuration.

A Foundation for a Custom CM7S Build

A barreled action allows the final rifle to be configured around its intended application. Because the CM7S uses a Remington 700 footprint and accepts R700-pattern triggers, builders can select compatible chassis, stock and trigger configurations around the core action and barrel assembly.

This makes the 458 SOCOM Barreled Action appropriate for customers who want the CM7S action and fast-twist Mos-Tek barrel but prefer to select the remaining components of their own custom rifle.

The 16-inch 458 SOCOM Barreled Action combines the CM7S action and fast-twist Mos-Tek barrel in a purpose-built foundation for a custom .458 SOCOM bolt-action rifle.

For builders who want to select their own stock, chassis, trigger and magazine configuration, the 458 SOCOM Barreled Action provides the core components of the CM7S system while preserving the flexibility of a custom build.

With its 16-inch 1:10 twist Mos-Tek barrel, the 458 SOCOM Barreled Action provides a purpose-built starting point for customers assembling a heavy-projectile or subsonic-focused bolt-action rifle.

The 458 SOCOM Barreled Action also gives the builder control over the final magazine system, chassis and trigger while retaining the CM7S action and .458 SOCOM barrel as the core of the build.

CM7S 458 SOCOM Barreled Action Specifications

• Product: Barreled Action
• Platform: CM7S Bolt Action
• Chambering: .458 SOCOM
• Action Footprint: Remington 700
• Action Weight: 25 oz
• Locking System: 3-Lug
• Bolt Throw: 60°
• Extractor: M16 Style
• Recoil Lug: Integrated
• Scope Rail: Pinned 20 MOA Picatinny
• Barrel: 16″ Mos-Tek
• Barrel Material: 416R Stainless Steel
• Rifling: 5R
• Twist: 1:10
• Barrel System: Remage
• Barrel Finish: E100 Blackout Cerakote
• Trigger Compatibility: Remington 700 Pattern
• Magazine Included: No

Frequently Asked Questions

Is the CM7S chambered in 458 SOCOM XL?
No. The chambering is .458 SOCOM. SOCOM XL describes an extended cartridge overall-length configuration used in compatible Chattahoochee Munitions firearms; it is not a different chamber or cartridge case.

What does SOCOM XL change?
SOCOM XL provides additional room in a compatible firearm and magazine configuration for long .458-caliber projectiles to be seated farther out. The .458 SOCOM chamber and cartridge case remain unchanged.

Does the 458 SOCOM barreled action include a magazine?
No. A magazine is not included with the barreled action. The customer completing the firearm is responsible for selecting and validating the magazine system used in the finished build.

Can I use Chattahoochee Munitions’ modified SOCOM XL magazine with my custom build?
Complete Chattahoochee Munitions CM7S SOCOM XL firearms use a modified MDT metal AICS magazine configured by CM. Chattahoochee Munitions guarantees the function of that modified magazine only as part of a complete CM firearm. Function cannot be guaranteed in customer-completed builds because chassis selection, magazine positioning and other components can affect feeding.

Can the CM7S use subsonic ammunition?
Yes. The bolt-action operating system is well suited to heavy subsonic ammunition because firearm operation does not depend on the ammunition generating sufficient gas to cycle a semi-automatic action.

Does Chattahoochee Munitions offer ammunition for its complete CM7S SOCOM XL rifles?
Yes. Chattahoochee Munitions offers a 650gr Maker REX 458 SOCOM subsonic load at a 2.802-inch overall length for the bolt-action side of the Terminal 458 system. Customers completing their own barreled-action build must verify compatibility with their finished firearm and magazine configuration.

Is this the same ammunition used in the CM10?
No. The CM10 semi-automatic platform uses a separate 650gr load at a 2.790-inch overall length with a propellant configuration developed around semi-automatic cycling requirements.

What stocks, chassis and triggers are compatible with the CM7S?
The CM7S uses a Remington 700 footprint and accepts Remington 700-pattern triggers. Compatibility of the complete build ultimately depends on the specific components selected by the builder.

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

Build Around the CM7S

The 16-inch CM7S 458 SOCOM Barreled Action brings together the CM7S bolt action and fast-twist Mos-Tek barrel as the foundation for a custom .458 SOCOM rifle. The builder retains control over the chassis or stock, trigger, magazine system and other components used to complete the firearm.

For customers who prefer a fully integrated SOCOM XL system with magazine function validated by Chattahoochee Munitions, explore our complete CM7S firearms through Terminal 458.