CMMG BANSHEE 300 5.7x28mm upper receiver has a 5-inch barrel and features CMMG’s patented Radial Delayed Blowback operating system. The receiver and hand guard are hard coat anodized and come with a pre-installed CMMG Ambi Charging Handle, and a CMMG RML4 M-LOK Hand Guard. This package ships with three 40-round 5.7 AR Conversion Magazines.

This 5.7x28 Upper Groups comes complete with BCG

TECH SPECS:
CALIBER: 5.7x28mm
BARREL: 5” 1:9 Twist, Medium Taper 416SS
MUZZLE: Thread Protector, threaded 1/2-28
GAS PORT LOCATION: N/A
RECEIVER: Forged 7075-T6 AL M4 type upper
HAND GUARD: CMMG RML4 M-Lok hand guard
FINISH: Hard Coat Anodized Receivers and Hand Guard
CHARGING HANDLE: CMMG Oversized Ambi
MAGAZINE: CMMG 40Rd x3
Stock # 57EF18E9

What is Radial Delayed Blowback?

The Radial Delayed Blowback (RDB) system was created from the ground up by CMMG to eliminate problems with traditional blowback systems found in pistol caliber AR15’s. The biggest advantage of the RDB system is a gun that weighs less while simultaneously having less felt recoil.

With a traditional blowback system, the only thing keeping the chamber closed is the weight of the bolt and the action spring tension. As a result, the more powerful the cartridge is, the more weight is needed to keep the bolt closed long enough to safely operate. With the RDB system the bolt must be forced to rotate and unlock itself before it will cycle. This slows things down enough for chamber pressures to drop to safe levels ensuring reliable, and safe, operation without the need for heavy bolts or stiff action springs.

All Products come with CMMG’s Lifetime Quality Guarantee

ALL NFA RULES APPLY