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The .300 Blackout cartridge was designed from day one to do its work in short barrels, and the Banshee Mk4 is CMMG leaning all the way into that idea. The 8-inch 4140 chrome moly barrel gets a salt bath nitride treatment for wear and corrosion resistance, a 1:7 twist that stabilizes everything from light supersonics to heavy 220-grain subsonics, and a pistol-length gas system tuned for the cartridge. Out at the muzzle you get 5/8×24 threads wearing CMMG's Zeroed linear compensator, which pushes blast and concussion forward instead of back at you. Spin that comp off and you have a natural home for a .30 caliber can, which is where this platform really comes alive with subsonic ammo.
A lot of AR pistols ship with bargain-bin lower parts and expect you to fix it later. CMMG skips that step. This Banshee comes out of the box with their Zeroed drop-in trigger, a 60/90 degree ambidextrous safety you can set to the throw you prefer, an ambi charging handle, ambi mag catch with an extended release button, Zeroed pistol grip, and a polymer dust cover. The EML handguard gives you full-length M-LOK real estate on the sides and bottom plus Picatinny sections up top, so lights, lasers, and hand stops all have a place to live without adding bulk.
At roughly 4.7 pounds with an overall length around 23.7 inches, this is a genuinely handy package that stores easily and maneuvers well in tight spaces. The Armor Black Cerakote finish holds up to real use, and the flat top receiver is a blank canvas since no sights are included, so plan on a red dot or backup irons. One 30-round Magpul PMAG ships in the box, and it feeds from standard AR-15 magazines, so mags are cheap and everywhere. CMMG builds these in the USA and stands behind them with a lifetime guarantee against defects, which says plenty about how much they trust their own work.
Yes. The 8-inch barrel is threaded 5/8×24, which is the standard thread pitch for .30 caliber suppressors and muzzle devices. It ships with CMMG's Zeroed linear compensator installed, so you can run it as-is or swap on your can. The pistol-length gas system is tuned for .300 Blackout, which makes it a strong pairing for suppressed subsonic shooting.
No, this model ships without sights. The upper receiver and handguard have Picatinny rail sections up top, so mounting a red dot, low-power variable optic, or backup iron sights is quick and easy. Most buyers pair a short barrel like this with a red dot for fast target acquisition.
That is exactly what this setup is built for. The 1:7 twist barrel stabilizes light supersonic loads as well as heavy 200 to 220 grain subsonics, and the pistol-length gas system is tuned around the cartridge. As with any .300 Blackout gun, some unsuppressed subsonic loads may need a suppressor's added backpressure to cycle with full reliability, so test your preferred ammo.
It feeds from standard AR-15/5.56 pattern magazines since .300 Blackout uses the same case head and magazine dimensions. One 30-round Magpul PMAG comes in the box. Dedicated .300 Blackout marked PMAGs are also available and are a smart way to keep your Blackout mags visually separated from your 5.56 mags.
| UPC | 810144724119 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 30A240FAB |
| Action | |
| Barrel Length | 8" |
| Caliber/Gauge | .300 AAC Blackout |
| Capacity | 30 + 1 |
| Color | Black |
| Length | 39.7500 |
| Model | |
| Number of Magazines | 1 |
| Safety | CMMG Zeroed 60/90 Degree |
| Shipping Weight | 9.05 |
| Sights Type | NONE |
| State Restriction (IL) | NO SALE TO ILLINOIS PICA |
| State Restriction (OR) | NO SALE TO OREGON |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
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