Chattahoochee Munitions manufactures this 458 SOCOM suppressed barreled action: a CM7S bolt action with an unported 12.5-inch Mos-Tek 416R stainless barrel, a 1:10 twist, and the all-titanium PLACID OTB over-the-barrel suppressor. It is chambered in 458 SOCOM and configured for 458 SOCOM XL. Add your own Remington 700-footprint stock or chassis and trigger.
Standard 458 SOCOM is limited to 2.260 inches overall by the AR15 magazine. 458 SOCOM XL moves past that limit: the 2.035-inch, 650 gr subsonic projectile is seated less deeply, reclaiming usable case capacity for powder. See every configuration on Terminal 458.
Why a 458 SOCOM Suppressed Barreled Action
A 458 SOCOM suppressed barreled action pairs the short-barrel subsonic setup Terminal 458 is designed around with a suppressor that extends back over the barrel instead of hanging entirely past the muzzle. The 12.5-inch barrel is the length the 650 gr subsonic load is developed in, and the bolt action adds no action noise. The barreled action with the PLACID OTB weighs 4 lb 15.7 oz.
PLACID OTB Over-the-Barrel Suppressor
The PLACID OTB is titanium, rated for .458 caliber, 18.25 inches long and 1.5 inches in diameter, and weighs 23.6 oz. It is designed for the CM7S. The PLACID OTB is regulated under the National Firearms Act and transfers on its own approved ATF Form 4, and completing the 12.5-inch barreled action as a rifle makes it a short-barreled rifle that also requires approval; see NFA Firearms. Read the 458 SOCOM suppressor guide.
CM7S Action
The CM7S action is steel with a Remington 700 footprint and a full PVD coating. It has three locking lugs, a 60-degree throw, wire EDM raceways, and a one-piece spiral-fluted bolt with a .718-inch body, an oversized knob, an M16-style extractor, and a .062-inch firing pin. Its .308-size bolt face fits the 458 SOCOM rebated rim. An integrated recoil lug and a pinned 20 MOA Picatinny rail complete the action, and the fire control removes without tools. It accepts Remington 700-pattern triggers, such as the TriggerTech Remington 700 Primary.
12.5-Inch Barrel and 1:10 Twist
The 12.5-inch barrel is made by Mos-Tek from 416R stainless steel with 5R rifling and a 1:10 twist, unported, finished in E100 Blackout Cerakote, with a shouldered crown and Remage barrel-nut mounting. Read 458 SOCOM barrel length.
Completing the Barreled Action
The barreled action fits stocks and chassis inletted for the Remington 700 footprint, with a Remington 700-pattern trigger. To feed 458 SOCOM XL, the stock or chassis needs an AICS-pattern magazine well and the 458 SOCOM XL magazine, which is modified for XL length and is not suitable for shorter, standard 458 SOCOM loads. Chattahoochee Munitions guarantees magazine function in its complete CM7S firearms. In a rifle you assemble yourself, the stock or chassis, bottom metal, and magazine well affect feeding, so verify compatibility before use. For a complete, ready-to-shoot rifle, see the CM7S 458 SOCOM suppressed SBR with the PLACID OTB.
Ammunition
The Chattahoochee Munitions 458 SOCOM subsonic ammo for bolt action is a 650 gr Maker REX loaded to 2.802 inches. From a 12.5-inch CM7S barrel it averages about 1,010 fps and about 1,473 ft-lb at the muzzle. The barrel’s 1:10 twist stabilizes the long 650 gr bullet, where common AR15 458 SOCOM barrels use 1:14. Read 458 SOCOM ballistics and 458 SOCOM twist rate.
458 SOCOM Suppressed Barreled Action Specifications
- Manufacturer: Chattahoochee Munitions
- Chambering: 458 SOCOM, configured for 458 SOCOM XL (2.802-inch cartridge overall length)
- Barrel: 12.5-inch Mos-Tek 416R stainless steel, 5R rifling, unported
- Twist rate: 1:10
- Barrel finish: E100 Blackout Cerakote
- Crown: Shouldered
- Barrel mounting: Remage barrel nut
- Action: Steel, Remington 700 footprint, three locking lugs, 60-degree throw, wire EDM raceways, full PVD coating, about 25 oz
- Bolt: One-piece spiral-fluted, .718-inch body, oversized knob, .308-size bolt face, M16-style extractor, side-mounted bolt stop
- Firing pin: .062-inch
- Recoil lug: Integrated
- Optic rail: Pinned 20 MOA Picatinny
- Action threads: 1-1/16-16
- Trigger: Not included; accepts Remington 700-pattern triggers, with tool-less fire-control removal
- Suppressor: PLACID OTB over-the-barrel, titanium, .458 caliber, 18.25 inches long, 1.5-inch diameter, 23.6 oz
- Weight: 4 lb 15.7 oz, barreled action with PLACID OTB
- Included: CM7S action, 12.5-inch barrel, PLACID OTB suppressor
- Not included: Stock or chassis, trigger, magazine
458 SOCOM Suppressed Barreled Action FAQ
Who makes a 458 SOCOM suppressed barreled action?
Chattahoochee Munitions manufactures the CM7S 458 SOCOM suppressed barreled action with a 12.5-inch Mos-Tek 1:10 barrel and the PLACID OTB suppressor, configured for 458 SOCOM XL.
What is included?
The CM7S action, the 12.5-inch Mos-Tek barrel, and the PLACID OTB suppressor. The stock or chassis, trigger, and magazine are not included.
Is the CM7S a different chamber than 458 SOCOM?
No. The chamber is standard 458 SOCOM. The action is configured for 458 SOCOM XL, so it accepts the 2.802-inch, 650 gr cartridge.
What is an over-the-barrel suppressor?
A suppressor that extends back over the barrel instead of hanging entirely past the muzzle, which keeps the suppressed rifle shorter.
Is the 12.5-inch barrel ported?
No. The barrel is unported.
Does the barreled action include a magazine?
No. The 458 SOCOM XL magazine is sold separately. It is modified for 458 SOCOM XL and is not suitable for shorter, standard 458 SOCOM loads.
How much does it weigh?
The barreled action with the PLACID OTB weighs 4 lb 15.7 oz.
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