Chattahoochee Munitions manufactures this 8.6 Blackout subsonic SBR, a complete factory 8-inch CM7S bolt action pistol or SBR in FDE Metallic Cerakote with AI Dark Earth furniture. It is chambered in 8.6 Blackout with an 8-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.
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 Subsonic SBR
An 8.6 Blackout subsonic SBR is made for heavy .338 bullets below the speed of sound behind an enclosed suppressor. Subsonic ammunition has no supersonic crack, and the bolt action adds no action noise.
The 8-inch barrel keeps the suppressed firearm short. Ordered with the telescoping butt pad it is an SBR under the NFA; ordered with the Tailhook brace it ships as a pistol.
Pistol or SBR
Choose the rear assembly when you order. The pistol configuration uses a telescoping Tailhook brace with an adjustable cheek riser. The SBR configuration uses a telescoping butt pad with an adjustable cheek riser and is a short-barreled rifle under the National Firearms Act, which transfers through your dealer after an approved ATF Form 4; see NFA Firearms. Length of pull is 6 inches collapsed, with stops at 11.5 and 12.5 inches and 13.5 inches fully extended.
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.
CM7 Chassis
The billet aluminum CM7 chassis has an AICS-pattern magazine well with an ambidextrous release, M-LOK slots, integrated QD sling sockets and a full-length bottom ARCA rail, with the CM Vertical Precision Crossover Grip. The same chassis is sold on its own as the CM7S Bolt Action Chassis.
8-Inch Barrel and 1:3 or 1:5 Twist
The 8-inch barrel on this 8.6 Blackout subsonic 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. An 8-inch barrel gives lower velocity than those test barrels; read 8.6 Blackout barrel length. 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; 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 8.6 Blackout bolt action, the 12.5-inch 8.6 Blackout pistol and the semi-automatic 8.6 Blackout semi auto SBR.
8.6 Blackout Subsonic SBR Specifications
- Manufacturer: Chattahoochee Munitions
- Platform: CM7S bolt action
- Chambering: 8.6 Blackout
- Configuration: Pistol or SBR
- Barrel: 8-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
- Chassis: Billet aluminum CM7, FDE Metallic Cerakote, AI Dark Earth furniture
- Rear assembly: Pistol: telescoping Tailhook brace with adjustable cheek riser; SBR: telescoping butt pad with adjustable cheek riser
- Magazine: One 10-round AICS-pattern magazine included
- Overall length: 20.50-28.00 inches
- Length of pull: 6-13.5 inches (6 collapsed, stops at 11.5 and 12.5, 13.5 fully extended)
- Weight: 5 lb 12 oz, complete firearm; the listing weight is for shipping
8.6 Blackout Subsonic SBR FAQ
Who makes an 8.6 Blackout Subsonic SBR?
Chattahoochee Munitions manufactures this 8-inch CM7S 8.6 Blackout in FDE Metallic Cerakote, with a Mos-Tek 416R barrel and a TriggerTech trigger.
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 it a pistol or an SBR?
Either. With the Tailhook brace it ships as a pistol; with the telescoping butt pad it is a short-barreled rifle under the NFA and needs an approved ATF Form 4.
Is an 8.6 Blackout Subsonic 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 5 lb 12 oz. Any heavier listing weight is the shipping weight.
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