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The .300 Blackout cartridge was born for short barrels, and the CMMG Banshee MK4 gives it a proper home. This 12.5 inch configuration hits a sweet spot in the Banshee lineup, long enough to squeeze real velocity out of supersonic loads, short enough to stay quick-handling when you hang a can off the 5/8×24 threaded muzzle. The 4140 chrome moly barrel wears a salt bath nitride finish inside and out, runs a 1:7 twist to stabilize everything from light 110 grain supers to heavy 220 grain subsonics, and feeds off a pistol-length gas system that cycles both without fuss.
CMMG didn't build this one from a parts bin. The Banshee MK4 ships with the company's Zeroed component line throughout: a drop-in single stage trigger with a clean, consistent break, an ambidextrous safety selector you can set to a 60 or 90 degree throw, an ambi charging handle, a comfortable Zeroed pistol grip, and a linear compensator that pushes blast and concussion forward instead of back at you. That last bit matters more than people think on a gun this size. The 6 position RipBrace deploys fast to your preset length, and the whole thing is dressed in Coyote Tan Cerakote over aluminum receivers for a finish that shrugs off weather and holster wear alike.
The 7 inch EML handguard runs full-length M-LOK slots along both sides and the bottom, plus additional M-LOK real estate between the top Picatinny sections. Lights, lasers, hand stops, sling mounts, whatever your setup calls for, there's room for it, and the flat-top Picatinny rail takes your red dot or LPVO without adapters. Range reports on the Banshee line consistently praise how flat and soft these guns run for their size, and the fit and finish reflects CMMG's made-in-the-USA build quality, backed by their Lifetime Quality Guarantee. A 30 round Magpul PMAG comes in the box, so you're ready to load up and go the day it arrives. For home defense, truck gun duty, or a dedicated suppressor host, this one checks the boxes without needing a single upgrade.
It's one of the better factory options out there for it. The .300 Blackout cartridge was designed from the ground up for suppressed shooting, and the 12.5 inch barrel comes threaded 5/8×24 with the linear comp easily removed for your can. Heavy subsonic loads in the 190 to 220 grain range are where a suppressed Blackout really shines.
Yes. The pistol-length gas system is set up to cycle the full range of .300 Blackout loads, and the 1:7 twist barrel stabilizes everything from light supers to heavy subs. Reviewers who have run the Banshee line report smooth cycling across hundreds of rounds with no hiccups.
No, it ships without sights, which is pretty standard for AR pistols in this class. The full-length top Picatinny rail gives you plenty of room to mount a red dot, LPVO, or backup irons. Most buyers pair a short barrel like this with a compact red dot for fast target acquisition.
The Zeroed line is CMMG's upgraded parts family, and this Banshee ships loaded with them. You get a drop-in single stage trigger, an ambidextrous safety with a selectable 60 or 90 degree throw, an ambi charging handle, and a linear compensator that directs muzzle blast forward. Between those and the RipBrace, there's not much left on the typical upgrade list.
| UPC | 810148623623 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 30AB20FCT |
| Action | |
| Barrel Length | 12.5" |
| Caliber/Gauge | .300 AAC Blackout |
| Capacity | 30 + 1 |
| Safety | CMMG Zeroed 60/90 Degree |
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