Chattahoochee Munitions manufactures this 8.6 Blackout semi auto SBR, a complete factory 8-inch CM10 AR10 pistol or SBR in Cobalt Kinetics Green Cerakote with Coyote B5 Systems 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, customized feed ramps for long .338 bullets, a Superlative Arms .875 adjustable gas block and an ODIN Works AR10 adjustable buffer.
Cobalt Kinetics Green is the Cerakote color of the finish; Chattahoochee Munitions is the manufacturer. 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 Semi Auto SBR
An 8.6 Blackout semi auto SBR with an 8-inch barrel keeps a suppressed .338 semi-automatic short enough for vehicles, blinds and tight cover.
The adjustable gas block and buffer let you tune it for subsonic ammunition with a suppressor. Ordered with the B5 Systems Bravo stock it is an SBR under the NFA; with the SBPDW brace it ships as a pistol.
Pistol or SBR
Choose the rear assembly when you order. The pistol configuration uses a three-position SBPDW brace with a QD sling point. The SBR configuration uses a mil-spec adjustable buffer tube with a B5 Systems Bravo stock 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.
Adjustable Gas and Buffer
Subsonic and supersonic 8.6 Blackout loads, with or without a suppressor, produce very different gas pressure at the port. The Superlative Arms .875 adjustable gas block sets gas flow, and the ODIN Works AR10 adjustable buffer sets reciprocating mass, so this 8.6 Blackout semi auto SBR can be tuned to the ammunition and suppressor you actually use. The low-mass bolt carrier group has a 9310 steel bolt that is high-pressure tested and magnetic-particle inspected, with a nitride-coated bolt, carrier and gas key.
CM10 Receivers and Trigger
The CM10 receivers are machined from 7075-T6 billet aluminum and take SR25-pattern magazines and DPMS High Profile components. The lower has an ambidextrous safety, magazine release and bolt release, and the upper has a CM10 ambidextrous charging handle. The TriggerTech Duty trigger comes single-stage straight, single-stage curved or two-stage straight.
8-Inch Barrel, Twist and Handguard
The 8-inch barrel is made by Mos-Tek from 416R stainless steel with 5R rifling, finished in E100 Blackout Cerakote, with a shouldered crown, M18x1.5 muzzle threads and a .875-inch gas block journal. 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.
The standard SLR ZRO 7.25-inch M-LOK handguard keeps the muzzle ahead of the handguard; the SLR SD ZRO version extends to 11.25 inches with a 1.8-inch inside diameter to cover a compatible suppressor. Order it with an optional muzzle brake or a thread protector.
Ammunition and Magazines
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 an AR10 version. Read 8.6 Blackout ammo.
It ships with one 20-round Magpul PMAG 7.62 in Coyote. Spares are the 10-round 8.6 Blackout AR10 magazine and the 20-round 8.6 Blackout magazine, both vetted by Chattahoochee Munitions for the CM10.
Suppressing the CM10
The CM10 is gas operated. With supersonic ammunition, a flow-through suppressor limits back pressure. With subsonic ammunition, Chattahoochee Munitions recommends an enclosed suppressor rated for .338 caliber or larger on this 8.6 Blackout semi auto SBR, tuned with the adjustable gas block and buffer. 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 AR pistol in Black Tungsten, the 12.5-inch 8.6 Blackout AR10 SBR and the bolt action 8.6 Blackout subsonic SBR.
8.6 Blackout Semi Auto SBR Specifications
- Manufacturer: Chattahoochee Munitions
- Platform: CM10 AR10 (SR25 pattern, DPMS High Profile)
- Chambering: 8.6 Blackout
- Configuration: Pistol or SBR
- Receivers: 7075-T6 billet aluminum, Cobalt Kinetics Green Cerakote
- Barrel: 8-inch Mos-Tek 416R stainless steel, 5R rifling
- Twist rate: 1:3 or 1:5
- Barrel finish: E100 Blackout Cerakote
- Muzzle: M18x1.5 threads, shouldered crown; optional muzzle brake or thread protector
- Gas: Superlative Arms .875 adjustable gas block, pistol-length gas system
- Buffer: ODIN Works AR10 adjustable
- Bolt carrier group: Low mass, 9310 steel bolt, nitride coated
- Trigger: TriggerTech Duty: single-stage straight, single-stage curved or two-stage straight
- Handguard: SLR ZRO 7.25-inch or SLR SD ZRO 7.25/11.25-inch M-LOK
- Rear assembly: Pistol: SBPDW brace; SBR: B5 Systems Bravo stock
- Furniture: B5 Systems, Coyote
- Magazine: One 20-round Magpul PMAG 7.62 in Coyote, included
- Overall length: 20.50-28.00 inches
- Length of pull: 10.75-13.25 inches
- Weight: 6 lb 12 oz with an unloaded magazine; the listing weight is for shipping
8.6 Blackout Semi Auto SBR FAQ
Who makes an 8.6 Blackout Semi Auto SBR?
Chattahoochee Munitions manufactures this 8-inch CM10 8.6 Blackout in Cobalt Kinetics Green Cerakote, with a Mos-Tek 416R barrel, customized feed ramps and a TriggerTech Duty trigger.
Is Cobalt Kinetics Green the maker of this firearm?
No. Cobalt Kinetics Green is the name of the Cerakote color on the finish. Chattahoochee Munitions manufactures the firearm.
Can 8.6 Blackout run in an AR15?
No. 8.6 Blackout is made from the 6.5 Creedmoor case and needs a .308-size bolt face and large-frame receivers, which is why Chattahoochee Munitions chambers it in the CM10 AR10.
Why does the CM10 have both adjustable gas and an adjustable buffer?
They are two separate tuning points. The gas block sets gas flow and the buffer sets reciprocating mass, so the firearm can be tuned to subsonic or supersonic ammunition, suppressed or not.
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 SBPDW brace it ships as a pistol; with the B5 Systems Bravo stock it is a short-barreled rifle under the NFA and needs an approved ATF Form 4.
What magazine does it use?
SR25-pattern magazines. It ships with one 20-round Magpul PMAG 7.62 in Coyote, and the CM10 10-round and 20-round 8.6 Blackout magazines are sold separately.
What ammunition does it fire?
SAAMI 8.6 Blackout factory ammunition, such as Just Cause USA and Black Butterfly AR10 subsonic loads. Chattahoochee Munitions does not load 8.6 Blackout ammunition.
What suppressor should I use on it?
An enclosed suppressor rated for .338 caliber or larger for subsonic ammunition, or a flow-through suppressor for supersonic ammunition. The barrel has M18x1.5 threads.
How much does it weigh?
6 lb 12 oz with an unloaded magazine and no accessories. Any heavier listing weight is the shipping weight.
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