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The 5.7x28mm cartridge has carved out a real spot for itself in the compact PDW world, and CMMG's 8-inch Banshee upper is one of the cleaner ways to run it on an AR platform. Flat shooting, light on recoil, and plenty capable up close, the round gives you a fun and practical option whether you're plinking, running drills, or setting up a defensive build. Best part is this upper shows up complete, so there's no scavenging for a bolt carrier group or muzzle device to get it running.
The heart of this thing is CMMG's Radial Delayed Blowback system. Instead of relying on a heavy bolt and stiff spring like a straight blowback gun, the RDB bolt has to rotate and unlock before it cycles, which delays the action just long enough for chamber pressure to drop. The payoff is a lighter package with noticeably less felt recoil, which means faster follow-up shots and a smoother feel behind the trigger. It's the same operating system that let CMMG chamber calibers most folks consider tricky on an AR.
You get an 8-inch salt-bath-nitrided 4140 chrome-moly barrel with a 1:9 twist and 1/2×28 muzzle threads, capped with CMMG's ZEROED linear compensator to push blast forward and away from you. The receiver is 6061-T6 aluminum wearing an Armor Black finish, wrapped in a slim CMMG EML M-LOK handguard that gives you room to add lights, grips, or a hand stop wherever you like.
This upper plays nice with CMMG Mk57 lowers right out of the gate. Running it on a standard AR15 or Mk4 lower is also on the table as long as you pick up CMMG's 5.7 AR conversion mags to feed it. Complete with the matched Mk57 bolt carrier group and an ambidextrous charging handle, it's about as close to a grab-and-build setup as you'll find in this caliber.
Yes, it will run on a standard AR15 or Mk4 lower as long as you use CMMG's 5.7 AR conversion magazines to feed it. It also drops straight onto a CMMG Mk57 lower without any extra parts. Either way, you're getting a compact 5.7x28mm build off a familiar AR platform.
It does. The upper ships complete with the matched Mk57 bolt carrier group along with an ambidextrous charging handle and the ZEROED linear compensator already installed. You'll just need a compatible lower and magazines to have a running gun.
Radial Delayed Blowback is CMMG's operating system where the bolt has to rotate and unlock before it cycles, letting chamber pressure drop first. That lets them skip the heavy bolt and stiff spring found in straight blowback guns, so you get a lighter build with less felt recoil. In practice that translates to a smoother shooter and quicker follow-up shots.
No, magazines are not part of this package. If you're pairing it with a standard AR15 lower you'll want CMMG's 5.7 AR conversion mags, while a Mk57 lower setup uses its own compatible magazines. It's worth grabbing those at the same time so you're ready to shoot.
| UPC | 810097504387 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 57B88BD-AB |
| Shipping Weight | 3.3 |
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