CM15 5.56 Backpack Gun 8″ – Cobalt Kinetics Green Cerakote

Chattahoochee Munitions manufactures the CM15 5.56 Backpack Gun, a complete factory 8-inch 5.56 NATO AR15 in Cobalt Kinetics Green Cerakote with Coyote B5 Systems furniture, offered as a pistol with an SBPDW brace or an SBR with a B5 Systems Bravo stock. It has a CrMV black nitrided 1:7 twist barrel threaded 1/2×28, a pistol-length gas system with a Superlative Arms adjustable gas block, an Odin adjustable buffer, a TriggerTech Duty trigger, ambidextrous controls and 7075-T6 billet receivers. It weighs 6 lb with an unloaded magazine and ships with one 30-round ETS magazine.

An 8-Inch 5.56 Backpack Gun

A backpack gun is a compact firearm that rides inside a pack, a vehicle or a small case until it is needed. The 5.56 Backpack Gun does that with an 8-inch 5.56 NATO barrel and an overall length of 24.31 inches with the brace collapsed, and it weighs 6 lb unloaded.

It is the Cobalt Kinetics Green Cerakote version of the 8-inch CM15, sharing every mechanical part with its Black Tungsten and FDE Metallic siblings: pistol-length gas, a 1:7 barrel and a Superlative Arms adjustable gas block. A short 5.56 gives up velocity and adds blast, so it is a close-range firearm; carry hearing protection or run a flow-through suppressor where legal. Check state and local law on carrying and transporting a loaded or unloaded firearm in a pack.

5.56 Backpack Gun Specifications

• Chambering: 5.56 NATO (also fires .223 Remington)
• Barrel: 8-inch CrMV, black nitrided, 1:7 twist, shouldered crown, .750 gas journal, 1/2×28 thread
• Gas system: Pistol-length, Melonite gas tube, Superlative Arms .750 adjustable gas block
• Receivers: CM15 upper and lower CNC machined from 7075-T6 billet aluminum, mil-spec dimensions, Cobalt Kinetics Green Cerakote
• Handguard: CM15 LWS low-profile 7.25-inch M-LOK, QD sockets at 3 and 9 o’clock, full Picatinny top rail, Coyote B5 Systems rail covers
• Bolt carrier group: CM15 Low Mass, 9310 steel bolt, high-pressure tested and magnetic particle inspected, nitride coated
• Charging handle: CM15 ambidextrous, 7075 aluminum, made in collaboration with Breek Arms
• Controls: ambidextrous safety, magazine release and bolt release
• Trigger: TriggerTech Duty, single-stage straight, single-stage curved or two-stage straight, 3.5 lb
• Buffer: Odin adjustable buffer
• Brace or stock: pistol with SBPDW brace, or SBR with 6-position adjustable buffer tube and B5 Systems Bravo stock (Coyote)
• Grip: B5 Systems (Coyote)
• Muzzle: optional muzzle device selection or a thread protector
• Overall length: 24.31 to 26.81 inches
• Length of pull: 10.25 to 12.75 inches
• Weight: 6 lb with an unloaded magazine and no accessories (the listing’s weight and dimensions are for shipping)
• Magazine: one 30-round ETS magazine
• Warranty: limited lifetime, original purchaser

Pistol or SBR

Choose the configuration at checkout: a pistol with an SBPDW telescoping brace, or an SBR with a B5 Systems Bravo stock. An SBR is a short-barreled rifle regulated under the National Firearms Act, and state law varies, so confirm what applies to you before ordering the SBR option.

5.56 NATO and .223 Remington Ammunition

5.56 NATO is a low-cost target and training round, which makes this CM15 a natural place to start. When you want heavier bullets or subsonic performance, the same platform steps up to 300 Blackout, 6.5 Grendel, 6mm ARC, 350 and 400 Legend and 338 ARC. This CM15 has a 5.56 NATO chamber, so it fires both 5.56 and .223 Remington. Never fire 5.56 in a firearm marked only .223 Remington. The 1:7 twist stabilizes 55 to 77 gr bullets. Read 5.56 vs 223, 5.56 twist rate and 5.56 ballistics.

Suppressor

The CM15 is gas operated and 5.56 NATO is supersonic, so Chattahoochee Munitions recommends a flow-through suppressor to limit back pressure. See 5.56 suppressor.

Other Lengths and Finishes

The same CM15 in other finishes: 5.56 Pistol, 5.56 PDW. Other lengths: 5.56 Hog Rifle, 5.56 Home Defense AR15. Complete uppers: 5.56 Pistol Upper, 5.56 NATO Upper, 5.56 AR15 Upper. See the full lineup at Garrison 5.56 and the CM15 5.56 NATO category.

Guides: What is 5.56 NATO?, 5.56 barrel length, 5.56 for home defense, 5.56 for coyotes and hogs and 5.56 suppressor.

5.56 Backpack Gun FAQ

Who makes the CM15 5.56 Backpack Gun?

Chattahoochee Munitions manufactures the CM15 5.56 Backpack Gun as a complete factory 8-inch 5.56 NATO AR15.

How long is the 5.56 backpack gun?

24.31 inches with the brace collapsed and 26.81 inches extended, with the 8-inch barrel.

Who makes Cobalt Kinetics Green, the color or the 5.56 backpack gun?

Cobalt Kinetics Green is only the Cerakote color. Chattahoochee Munitions manufactures the 5.56 backpack gun.

What twist rate is the barrel?

1:7, which stabilizes 55 to 77 gr bullets.

Can this CM15 shoot .223 Remington?

Yes. Its 5.56 NATO chamber fires .223 Remington safely.

What trigger does this CM15 use?

A TriggerTech Duty at 3.5 lb: single-stage straight, single-stage curved or two-stage straight.

How much does it weigh?

6 lb with an unloaded magazine and no accessories.

What magazine does it take?

Standard AR15 5.56 magazines. It ships with one 30-round ETS magazine; spares are the CM15 5.56 Magazine.

Can I suppress this CM15?

Yes. Use a flow-through suppressor rated for 5.56; the barrel is threaded 1/2×28 and the gas block is adjustable.

Is 556 the same as 5.56 NATO?

Yes. 556 is shorthand for 5.56 NATO.