THIS PRODUCT IS BACKED BY THE CMMG LIFETIME QUALITY GUARANTEE.
UPPER GROUP KIT, BANSHEE™ 300, MK57, 5.7 X 28MM, 3 10RD MAGS
The BANSHEE 300 5.7x28mm upper receiver has a 5-inch barrel and features CMMG’s patented Radial Delayed Blowback operating system. The receiver and handguard are hard coat anodized, and come with a pre-installed CMMG Ambi Charging Handle, and a CMMG RML4 M-LOK Handguard. This package ships with three 10-round 5.7 AR Conversion magazines.
All of our Upper Groups come complete with BCG.
All Products come with CMMG’s Lifetime Quality Guarantee. ALL NFA RULES APPLY.
Technical Specifications
| Platform | Mk57 |
| Caliber | 5.7x28mm, 5.7x28mm (Conversion) |
| Operating System | Radial Delayed Blowback |
| Barrel Length | 5 |
| Barrel Twist | 1:9 |
| Barrel Contour | MT |
| Barrel Material | 416SS, SBN |
| Barrel Twist | 1:9 |
| Muzzle Device | Thread Protector |
| Muzzle Thread | 1/2 X 28 |
| Gas Port Location | N/A |
| Gas Block | N/A |
| Upper Receiver | Forged 7075-T6 AL M4 type upper |
| Hand Guard | CMMG RML4 M-LOK |
| Charging Handle | CMMG Oversized Ambi |
| Magazine | CMMG 10rd X3 - Same Size As 25rd CMMG Mag |