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The .300 Blackout cartridge was designed from the ground up to run in short barrels, and the CMMG Banshee Mk4 is one of the better homes you can give it. The 8-inch 4140CM barrel wears a durable black nitride finish and a 1:7 twist that stabilizes everything from fast supersonic loads to heavy subsonics. Muzzle threads are the standard 5/8×24, and CMMG ships it with their ZEROED linear compensator installed, which pushes blast forward and keeps this little pistol surprisingly pleasant to run. Pull that comp off and you have a ready-made host for your suppressor, which is where .300 BLK subs really shine.
CMMG did not just slap a short barrel on a standard AR and call it a day. The Banshee comes loaded with their ZEROED parts package, including a drop-in trigger, a 60/90 degree ambidextrous safety, ambi charging handle, ambi mag catch with an extended release button, and their own pistol grip. The RipBrace is a standout too, with a quick-deploy design that snaps out to your preset length the moment you pull on it. Rounding things out, the EML7 handguard gives you full-length M-LOK slots on the sides and bottom plus more M-LOK between the top rail sections, so lights, lasers, and hand stops all have a place to live.
This configuration pairs Coyote Tan Cerakote receivers with black furniture for a clean two-tone look that stands out from the sea of all-black ARs. It feeds from a 30-round PMAG, giving you 30+1 on tap, and the whole package is built in the USA with the fit and finish CMMG has built its reputation on.
Whether you want a compact truck gun, a home-defense setup, or a dedicated suppressor host, this Banshee checks the boxes without needing a single upgrade out of the box.
It is one of the more popular choices for exactly that. The .300 Blackout cartridge was developed with subsonic, suppressed shooting in mind, and the 8-inch barrel burns the powder charge efficiently. The muzzle is threaded 5/8×24, so most .30 caliber cans thread right on once you remove the factory linear comp.
It runs standard AR-15 pattern magazines and ships with a 30-round Magpul PMAG from the factory. Any quality 5.56-pattern mag will feed .300 BLK, though many owners like to dedicate clearly marked mags to Blackout to avoid mixing ammo with their 5.56 guns.
Yes, CMMG builds this one with an ambidextrous package. You get a 60/90 degree ambi safety, ambi charging handle, and an ambi mag catch with an extended release button. Lefties can run this pistol without fighting the controls.
It sure can. The 1:7 twist barrel stabilizes light supersonic loads for defensive or general range use as well as heavy 190 to 220 grain subsonics for quiet suppressed shooting. Just note that some subsonic loads without a suppressor may need a stronger buffer setup or specific ammo to cycle consistently, which is normal for any .300 BLK gun.
| UPC | 810148623555 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 30AF20ACT |
| Barrel Length | 8" |
| Caliber/Gauge | Banshee |
| Capacity | 30 + 1 |
| Safety | Yes |
| Shipping Weight | 10.6 |
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