Chattahoochee Munitions manufactures this 338 ARC bolt action SBR, a complete factory 12.5-inch CM7S bolt action short-barreled rifle with WOOX walnut and aluminum furniture. It is chambered in 338 ARC with a 12.5-inch Mos-Tek 416R stainless barrel, a 1:6 twist and a TriggerTech trigger, and it is made for suppressed subsonic hunting with the 307 gr subsonic bullet.
WOOX supplies the stock, forend and bottom metal; Chattahoochee Munitions manufactures the firearm. See every configuration in Containment Zone 338, and read 338 ARC hunting.
Why a 338 ARC Bolt Action SBR
A 338 ARC bolt action SBR with a 12.5-inch barrel keeps a suppressed hunting rifle short, at about 32 inches overall, while the subsonic load gives up little velocity.
The walnut WOOX stock adds a full-size length of pull and a traditional feel for stand and still hunting.
WOOX Walnut Furniture
The WOOX Exactus walnut stock has an adjustable cheek riser, a buttpad adjustable for height and length of pull (13.75 to 14.75 inches), a bottom Picatinny rail and a QD sling mount. The WOOX Furiosa walnut forend has M-LOK slots at 3, 6 and 9 o’clock. The WOOX Monocore links the action, stock and forend and uses M5-pattern bottom metal that accepts AICS-pattern detachable magazines.
With a 12.5-inch barrel and a stock, this 338 ARC bolt action SBR is a short-barreled rifle under the National Firearms Act and transfers through a licensed dealer after the NFA paperwork; see NFA Firearms.
CM7S Action and Trigger
The CM7S action is steel with a Remington 700 footprint and a full PVD coating, about 25 oz, with three locking lugs, a 60-degree throw, a .718-inch spiral-fluted bolt and the 6.5 Grendel Type II (.449-inch) bolt face matched to the ARC case head. The TriggerTech Remington 700 Primary trigger comes curved or straight and adjusts from 1.5 to 4.0 lb.
Barrel and 1:6 Twist
The 12.5-inch barrel is made by Mos-Tek from 416R stainless steel with 5R rifling and a 1:6 twist, finished in E100 Blackout Cerakote, with a shouldered crown and 5/8×24 muzzle threads. The 1:6 twist spins the long 307 gr subsonic bullet about a third faster than the 1:8 SAAMI figure. Read 338 ARC twist rate.
Ammunition and Magazine
It fires SAAMI 338 ARC factory ammunition, including the 307 gr Sub-X subsonic, which Hornady rates at 1,050 fps and 752 ft-lb from a 16-inch barrel, and supersonic hunting loads such as the 170 gr MonoFlex and 215 gr FTX. Chattahoochee Munitions does not load 338 ARC ammunition. It ships with one 10-round MDT polymer AICS-pattern magazine, tested by Chattahoochee Munitions with 338 ARC; spares are the 338 ARC bolt action magazine.
Suppressing the CM7S
Chattahoochee Munitions recommends an enclosed suppressor rated for .338 caliber or larger on the CM7S, with subsonic or supersonic ammunition. The bolt does not cycle when it fires, so the action adds no noise. The PLACID 375 is an enclosed suppressor rated from 5.56 NATO through .375. Read the 338 ARC suppressor guide.
Also see the 16-inch walnut-stocked CM7S, the chassis 16-inch CM7S 338 ARC and the 12.5-inch CM7S 338 ARC.
338 ARC Bolt Action SBR Specifications
- Manufacturer: Chattahoochee Munitions
- Platform: CM7S bolt action
- Chambering: 338 ARC
- Configuration: Short-barreled rifle (NFA)
- Barrel: 12.5-inch Mos-Tek 416R stainless steel, 5R rifling
- Twist rate: 1:6
- Barrel finish: E100 Blackout Cerakote
- Muzzle: 5/8×24 threads, shouldered crown
- Action: Steel, Remington 700 footprint, three locking lugs, 60-degree throw, full PVD coating, about 25 oz
- Bolt face: 6.5 Grendel Type II (.449-inch)
- Trigger: TriggerTech Remington 700 Primary, curved or straight, adjustable 1.5-4.0 lb
- Stock: WOOX Exactus walnut, adjustable cheek riser and buttpad, bottom Picatinny rail, QD sling mount
- Forend: WOOX Furiosa walnut, M-LOK at 3, 6 and 9 o’clock
- Bottom metal: WOOX Monocore, M5 pattern, AICS compatible
- Magazine: One 10-round MDT polymer AICS-pattern magazine included
- Overall length: 31.75-32.50 inches
- Length of pull: 13.75-14.75 inches
- Weight: 7 lb 12 oz, complete firearm; the listing weight is for shipping
338 ARC Bolt Action SBR FAQ
Who makes a 338 ARC Bolt Action SBR?
Chattahoochee Munitions manufactures this walnut-stocked 12.5-inch CM7S 338 ARC with a Mos-Tek 1:6 barrel and a TriggerTech trigger. WOOX supplies the stock, forend and bottom metal.
Is WOOX the manufacturer of this rifle?
No. Chattahoochee Munitions manufactures the firearm. WOOX makes the walnut stock, forend and Monocore bottom metal.
What twist rate does it use?
A 1:6 twist in a 12.5-inch Mos-Tek 416R stainless barrel with 5R rifling.
Is 338 ARC good for hunting?
Yes, for deer, hogs and medium game at moderate range with expanding bullets. Keep subsonic shots close because of the steep trajectory.
What magazine does it use?
One 10-round MDT polymer AICS-pattern magazine is included and fits the M5-pattern WOOX bottom metal.
Is the WOOX stock adjustable?
Yes. The cheek riser and buttpad adjust, and length of pull runs from 13.75 to 14.75 inches.
What suppressor should I use on it?
An enclosed suppressor rated for .338 caliber or larger. The barrel has 5/8×24 threads.
How much does it weigh?
The complete firearm weighs 7 lb 12 oz. Any heavier listing weight is the shipping weight.
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