Chattahoochee Munitions manufactures this 8.6 Blackout 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 8.6 Blackout with a 12.5-inch Mos-Tek 416R stainless barrel in a 1:3 or 1:5 twist and a TriggerTech trigger, and it is made for suppressed subsonic .338 bullets.
WOOX supplies the stock, forend and bottom metal; Chattahoochee Munitions manufactures the firearm. See every configuration in Area 8.6, and read What Is 8.6 Blackout? if the cartridge is new to you.
Why an 8.6 Blackout Bolt Action SBR
An 8.6 Blackout bolt action SBR with a 12.5-inch barrel keeps a suppressed hunting rifle short, about 32 inches overall, while subsonic loads finish burning their powder at that length in Chattahoochee Munitions testing.
The walnut 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 8.6 Blackout 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 has a Remington 700 footprint, three locking lugs, a 60-degree bolt throw, an M16-style extractor, a one-piece .718-inch spiral-fluted bolt, a pinned 20 MOA Picatinny rail, an integrated .300-inch recoil lug and a full PVD coating; the action weighs about 25 oz. The TriggerTech Remington 700 Primary trigger comes flat or curved and adjusts from 1.5 to 4.0 lb.
12.5-Inch Barrel and 1:3 or 1:5 Twist
The 12.5-inch barrel on this 8.6 Blackout bolt action SBR is made by Mos-Tek from 416R stainless steel with 5R rifling, finished in E100 Blackout Cerakote, with a shouldered crown, 5/8×24 muzzle threads and a Remage barrel nut. In Chattahoochee Munitions testing with barrels of about 12.5 inches and longer, the 1:5 twist suits bullets of about 300 gr and lighter, and the 1:3 twist suits heavy subsonic bullets of about 323 gr and heavier. Choose the twist for the bullet you plan to shoot. Read 8.6 Blackout twist rate.
Ammunition and Magazine
It fires SAAMI 8.6 Blackout ammunition. Chattahoochee Munitions does not load 8.6 Blackout ammunition. Just Cause USA lists its 350 gr Maker REX subsonic load at 950 fps from 8 inches, 980 fps from 12 inches and 1,040 fps from 16 inches. Black Butterfly lists its 305 gr and 352 gr subsonic loads at about 1,000 fps from a 12.5-inch 1:3 barrel, tested in a Chattahoochee Munitions firearm, and sells a bolt action version. Read 8.6 Blackout ammo.
It ships with one 10-round AICS-pattern magazine that fits the M5-pattern WOOX bottom metal; spares are the 8.6 Blackout magazine, a Magpul PMAG 10 7.62 AC vetted by Chattahoochee Munitions for the CM7S.
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 through .375 caliber. Read the 8.6 Blackout suppressor guide.
Compare the cartridge in 375 Raptor vs 8.6 Blackout and 338 ARC vs 8.6 Blackout, or the two platforms in 8.6 Blackout bolt action vs semi auto. Also see the 16-inch walnut 8.6 Blackout hunting rifle, the chassis 8.6 Blackout short barreled rifle and the 8.6 Blackout barreled action.
8.6 Blackout Bolt Action SBR Specifications
- Manufacturer: Chattahoochee Munitions
- Platform: CM7S bolt action
- Chambering: 8.6 Blackout
- Configuration: Short-barreled rifle (NFA)
- Barrel: 12.5-inch Mos-Tek 416R stainless steel, 5R rifling
- Twist rate: 1:3 or 1:5
- Barrel finish: E100 Blackout Cerakote
- Muzzle: 5/8×24 threads, shouldered crown
- Action: Remington 700 footprint, three locking lugs, 60-degree throw, full PVD coating, about 25 oz
- Bolt face: .308 Winchester family (.473-inch)
- Trigger: TriggerTech Remington 700 Primary, flat or curved, 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 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
8.6 Blackout Bolt Action SBR FAQ
Who makes an 8.6 Blackout Bolt Action SBR?
Chattahoochee Munitions manufactures this 12.5-inch CM7S 8.6 Blackout with walnut WOOX furniture, with a Mos-Tek 416R 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.
Should I choose a 1:3 or 1:5 twist?
Choose 1:3 for heavy subsonic bullets of about 323 gr and up, and 1:5 for bullets of about 300 gr and lighter. Those are Chattahoochee Munitions observations from barrels of about 12.5 inches and longer.
Is this an NFA item?
Yes. With a 12.5-inch barrel and a stock it is a short-barreled rifle under the NFA and transfers through a licensed dealer after an approved ATF Form 4.
Is an 8.6 Blackout Bolt Action SBR good for hunting?
Yes, for hogs and deer at close range with expanding subsonic bullets and a suppressor, or at longer range with supersonic hunting loads. Keep subsonic shots close because of the steep trajectory.
What ammunition does it fire?
SAAMI 8.6 Blackout factory ammunition, such as Just Cause USA and Black Butterfly subsonic loads. Chattahoochee Munitions does not load 8.6 Blackout ammunition.
What magazine does it use?
AICS-pattern short-action magazines. One 10-round magazine is included, and spares are the CM7S 8.6 Blackout magazine.
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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