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The 5.7x28mm cartridge has built a serious following over the past few years, and it makes sense once you shoot it. Fast, flat, and soft on recoil, it splits the difference between a rimfire and a centerfire rifle round in the best possible way. CMMG took that cartridge and dropped it into their Mk4 AR15 platform, and the result is the Banshee MK4, a compact pistol that runs 5.7 through a standard AR lower using CMMG's improved conversion magazines. No proprietary lower, no oddball parts hunt down the road.
The heart of the gun is CMMG's radial delayed blowback operating system, which softens the impulse compared to straight blowback designs and keeps the whole package running smooth. The 8-inch medium taper barrel wears a black nitride finish and a 1:9 twist, threaded 1/2×28 and capped with a ZEROED linear compensator that pushes blast forward instead of back at you. Up top sits a billet 6061 aluminum upper paired with a forged 7075 Mk4 lower, both finished in Armor Black Cerakote. The EML handguard gives you M-LOK real estate on the sides and bottom plus slots between the top Picatinny sections, so mounting lights, lasers, or a hand stop is simple.
Most ARs need a parts list before they feel right. This one comes sorted. CMMG includes their ZEROED single stage drop-in trigger, ambidextrous charging handle, 60/90 degree ambi safety, pistol grip, extended mag release, and ambi mag catch straight from the factory, all made in the USA. The six-position receiver extension carries CMMG's RipBrace, which deploys to your preset length with a quick pull.
At around 5 pounds with a 32-round magazine in the well, this is an easy gun to keep close and a genuinely fun one to run at the range. Velocity out of the 8-inch tube gets the most from the 5.7 cartridge, and CMMG backs the whole package with their Lifetime Quality Guarantee. Whether it becomes your truck gun, home defense setup, or your favorite plinker, it earns its spot.
No, and that's one of its biggest selling points. It's built on CMMG's Mk4 platform, which uses a standard AR15 lower receiver paired with CMMG's improved 5.7x28mm AR conversion magazines. That keeps parts availability and future customization wide open.
It runs CMMG's radial delayed blowback system, which uses a rotating bolt to delay the action opening. Compared to simple blowback guns, this allows a lighter bolt and buffer, which translates to a softer shooting impulse and less felt recoil. Combined with the already mild 5.7x28mm cartridge, this is a very easy gun to shoot fast and accurately.
Yes, the 8-inch medium taper barrel is threaded 1/2×28 and comes with a ZEROED linear compensator installed. Remove the comp and you can mount a suppressor or another muzzle device of your choice. The 5.7x28mm cartridge pairs nicely with a can, especially with subsonic or slower loads.
CMMG loads this Banshee up from the factory with their ZEROED parts line, including a single stage drop-in trigger, ambidextrous charging handle, 60/90 degree ambi safety, pistol grip, ambi mag catch, and extended mag release. It also ships with the RipBrace on a six-position receiver extension. There's very little you'd need to change out of the box.
| UPC | 810148624095 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 54AE10FAB |
| Action | |
| Barrel Length | 8" |
| Caliber/Gauge | 5.7 x 28 mm |
| Capacity | 32 + 1 |
| Safety | CMMG Zeroed 60/90 Degree |
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