CMMG Banshee 57BBCF0AB Upper Receiver 5.7x28mm
CMMG Banshee upper receiver in 5.7x28mm with 5-inch barrel, Armor Black finish, and M-Lok free-float handguard. Works with CMMG Mk57 or standard AR15 lowers.
Fits: AR15
CMMG Banshee 57BBCF0AB Upper Receiver
The 5.7x28mm cartridge has earned its reputation as a modern personal defense round, and this CMMG Banshee upper receiver puts that capability into your hands. Engineered for shooters who demand flat trajectories, minimal recoil, and reliable performance when it matters most.
Key Features
- Caliber: 5.7x28mm
- Barrel Length: 5 inches
- Finish: Armor Black
- Handguard: M-Lok free-float design for accessory mounting and consistent accuracy
- Compatibility: Works with CMMG Mk57 lowers or standard AR15/Mk4 lowers (requires 5.7 AR conversion magazines)
Performance Characteristics
The 5.7x28mm delivers exceptional ballistics at defensive ranges. Its flat shooting profile and low recoil impulse make follow-up shots fast and accurate. The round provides adequate penetration for personal defense applications while managing recoil in a way that benefits shooters of all experience levels.
Design & Construction
CMMG's upper receiver is built to exacting standards and integrates seamlessly into the AR platform ecosystem. The free-float handguard eliminates contact with the barrel, promoting consistent accuracy shot after shot. The M-Lok mounting system gives you flexibility to customize your setup with lights, lasers, or other tactical accessories.
Whether you're building a dedicated 5.7x28mm platform or exploring this modern cartridge for the first time, the Banshee upper receiver represents quality engineering and proven performance.
