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The 5.7x28mm cartridge has carved out a real following in the personal defense world, and it makes sense. You get high velocity, a flat trajectory, and recoil so mild it almost feels like a rimfire. CMMG took that formula and dropped it into their proven MK4 AR15 platform, and the result is the Banshee MK4, a 5" barreled pistol that gives you 40+1 rounds on tap in a package small enough to stash in a backpack or truck bag.
Under the hood is CMMG's Radial Delayed Blowback system, originally developed for their .45 ACP guns and adapted across the pistol caliber lineup. Compared to straight blowback designs, it cuts bolt weight and softens the recoil impulse noticeably. Pair that with a cartridge that barely pushes back to begin with and you get a gun that stays flat through fast strings of fire. The 5" 4140CM barrel wears a salt bath nitride finish and comes threaded 1/2×28 with a ZEROED linear comp installed, so swapping muzzle devices or adding a suppressor down the road is simple.
If pistol magazine fed ARs have never been your thing, this one keeps everything where you expect it. The Banshee uses a standard AR15 lower receiver paired with CMMG's improved 5.7x28mm AR conversion magazines, so the controls, grip angle, and manual of arms all feel like home. The EML4 handguard gives you M-LOK slots at the 3, 6, and 9 o'clock positions, a full-length Picatinny top rail for optics and lights, and an integrated handstop to keep your support hand planted on such a short gun. Ambidextrous ZEROED controls, a drop-in single stage trigger, and a quick deploying RipBrace round out the package.
The Midnight Bronze Cerakote finish looks sharp without being loud, and the whole build is backed by CMMG's lifetime quality guarantee. Whether you want a compact home defense setup or just a seriously fun range gun that eats through mags with a grin, this one delivers.
It runs CMMG's improved 5.7x28mm AR conversion magazines, which fit a standard AR15 magazine well. This version ships with a 40-round mag, so you get serious capacity without any oddball proprietary lower. Spare mags are available directly from CMMG and most major retailers.
It's noticeably softer. The 5.7x28mm is a light-recoiling round to begin with, and CMMG's Radial Delayed Blowback system reduces bolt weight and smooths out the impulse compared to straight blowback 9mm guns. The result is a flat-shooting pistol that makes fast follow-up shots easy.
Yes. The 5-inch barrel is threaded 1/2×28 and comes with a ZEROED linear comp from the factory, so you can remove it and mount a can or another muzzle device without any gunsmithing. The 5.7x28mm round also pairs nicely with a suppressor thanks to its small case and efficient powder charge.
Absolutely. The upper receiver and EML4 handguard provide a full-length Picatinny top rail, so red dots, magnifiers, and backup sights all mount right up. The M-LOK slots at 3, 6, and 9 o'clock handle lights, lasers, and hand stops.
| UPC | 810148624194 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 54A3B0FMB |
| Action | |
| Barrel Length | 5" |
| Caliber/Gauge | 5.7 x 28 mm |
| Capacity | 40 + 1 |
| Safety | Ambidextrous Safety Lever |
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