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There are plenty of 9mm AR pistols on the market, but the Banshee MK4 is the one that changed a lot of minds about how a pistol caliber gun should feel. Instead of the heavy bolt slap you get from typical straight blowback designs, CMMG's patented Radial Delayed Blowback system rotates the bolt out of battery, which lets them run a much lighter bolt and delivers a softer recoil impulse. The result is a gun that stays flat, gets back on target quick, and cycles a wide range of bullet weights without fuss, suppressed or not.
The Mk4 lower is a standard AR15-pattern forged 7075-T6 receiver that feeds from CMMG's 9mm AR conversion magazines, so the manual of arms is exactly what you already know from your AR. The upper is machined from billet 6061-T6 aluminum, and the 8-inch 4140 chrome moly barrel wears a salt bath nitride finish with 1/2×28 threads capped by CMMG's ZEROED linear compensator, which directs blast forward instead of back at your face. The whole package gets an Armor Black Cerakote finish that holds up to real use.
CMMG doesn't skimp on the small stuff here. You get a ZEROED drop-in single stage trigger, ambidextrous 60/90 degree safety, ambi charging handle, and an extended mag release button standard. The RipBrace is a clever piece of kit too. Set your preferred length once, collapse it down, and when you need it, just rip it straight back to your preset position with no lever to fumble.
At roughly 4.6 pounds and 23.7 inches overall, this thing is easy to maneuver, stage, or stash in a small bag. The EML4 M-LOK handguard gives you slots at 3, 6, and 9 o'clock plus a full-length Picatinny top rail, so mounting a red dot, light, or hand stop is simple. Add cheap 9mm range ammo and a 30-round magazine in the box, and you have a gun that earns its keep on drills, plinking days, and home defense duty alike. CMMG backs it with their lifetime quality guarantee.
It runs on CMMG's 9mm AR conversion magazines and ships with one 30-round 9ARC mag. These are AR15-format magazines with a 9mm conversion insert, so they drop into the standard AR-pattern magwell. CMMG also sells conversion adapters that let you turn existing PMAGs into 9mm mags, which keeps spares affordable.
Traditional blowback PCCs rely on a heavy bolt to keep the action closed, which means more reciprocating mass and more felt recoil. CMMG's Radial Delayed Blowback uses angled bolt lugs that force the bolt to rotate before it can open, delaying the action until pressure drops. That allows a lighter bolt, a softer recoil impulse, and a flatter-shooting gun that cycles everything from 115 to 147 grain loads reliably.
Yes. The 8-inch barrel is threaded 1/2×28 and comes with CMMG's ZEROED linear compensator installed, which spins off easily to mount a 9mm can. The Radial Delayed Blowback system handles suppressed shooting well and cycles both subsonic and supersonic ammo without tuning.
No, it ships optics ready with a full-length Picatinny top rail and no iron sights. Most owners pair it with a compact red dot, which suits the 9mm cartridge and the gun's fast-handling nature perfectly. Backup irons or a magnifier will mount just as easily if that is more your style.
| UPC | 840442503826 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 94A860F-AB |
| Action | |
| Barrel Length | 8" |
| Caliber/Gauge | 9mm |
| Capacity | 30 + 1 |
| Color | Black |
| Model | |
| Product Type | AR |
| Safety | CMMG Zeroed 60/90 Degree |
| Shipping Weight | 9.363 |
| Sights | Optics Ready |
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