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Most 9mm AR pistols run straight blowback, which means a heavy bolt slamming back and forth and more recoil than a pistol caliber gun should have. The Banshee MK4 does it differently. CMMG's Radial Delayed Blowback system uses an angled bolt that has to rotate before the action unlocks, so the bolt can be lighter and the whole gun cycles with a noticeably softer impulse. Pair that with a 5-inch barrel, the shortest 9mm tube CMMG offers, and you get a package that measures just 20.8 inches overall and weighs around 4.7 pounds. That is genuinely compact for an AR pattern gun.
The build quality here is a cut above most PCC pistols. The upper is billet 6061-T6 aluminum, the lower is forged 7075-T6, and the whole thing wears a durable Armor Black Cerakote finish. The 4140CM barrel gets a salt bath nitride treatment, spins a 1:10 twist, and comes threaded 1/2×28 with CMMG's ZEROED linear comp installed, which pushes blast forward instead of back at you. Suppressor owners will appreciate that thread pattern too, since 9mm cans spin right on. Controls are handled by CMMG's ZEROED parts kit, including an ambidextrous charging handle, ambi 60/90 degree safety selector, pistol grip, and trigger guard, all made in the USA.
The EML4 handguard gives you M-LOK slots at 3, 6, and 9 o'clock plus a full-length Picatinny top rail and an integrated handstop, so lights, lasers, and hand positions are all covered. The RipBrace deploys fast, pull it straight back to your preferred position without fumbling with an adjustment lever, thanks to the six-position FASTBACK receiver extension. Feeding comes from a 30-round 9ARC conversion-style magazine, and since the lower is a standard AR15 pattern, the manual of arms is exactly what you already know. Top rail is clean and optics ready, so mount your favorite red dot and go. CMMG backs it all with a lifetime quality guarantee, which says plenty about how they build these.
Standard blowback guns rely on a heavy bolt and spring to keep the action closed, which creates a harsh, clunky recoil impulse. CMMG's Radial Delayed Blowback uses an angled bolt that must rotate before the action can cycle, delaying unlock and allowing a much lighter bolt. The result is softer recoil, less reciprocating mass, and a smoother shooting experience overall.
It feeds from CMMG's 9ARC conversion-style magazines and ships with one 30-rounder. These are AR15-footprint mags, and CMMG also sells conversion adapters that let you turn standard PMAGs into 9mm magazines, so you can build up a mag supply without much hassle.
Yes. The 5-inch barrel is threaded 1/2×28, the standard pitch for 9mm suppressors, so most cans thread right on after removing the included ZEROED linear comp. The Radial Delayed Blowback action also tends to run cleaner and softer suppressed than straight blowback designs, which is a big part of why these are popular suppressor hosts.
No, it ships optics ready with a clean full-length Picatinny top rail and no iron sights installed. Most owners run a compact red dot, which suits the short barrel and close-quarters role well. Backup irons or a magnifier can be added easily thanks to the continuous top rail.
| UPC | 840442503758 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 94AD90F-AB |
| Action | |
| Barrel Length | 5" |
| Caliber/Gauge | 9mm |
| Capacity | 30 |
| Color | Black |
| Model | |
| Product Type | AR |
| Safety | Ambidextrous |
| Shipping Weight | 9.016 |
| Sights | Optics Ready |
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