Upper Group, BANSHEE, FE, .45 ACP, 5"

Chambered in one of the most iconic calibers with over a century of faithful use, the 5” BANSHEE™ MkG upper group in 45 ACP is the shortest MkG upper CMMG® offers. Ready to pair out of the box with an existing or new MkG lower group, this upper is the piece you need to build the ultimate fun-sized AR pistol or SBR. Available in different Cerakote finishes, all CMMG Upper Groups come complete with bolt carrier group and ZEROED ambi charging handle.

MkG Radial Delayed Blowback™ Operating System

Since making its debut on the original .45 ACP MkG platform in 2017, Radial Delayed Blowback has revolutionized pistol caliber ARs across the entire CMMG lineup. As a result of meticulous engineering, Radial Delayed Blowback not only addressed some operational concerns with a traditional straight blowback system, but it also delivered pistol caliber carbines and personal-defense weapons with softer recoil impulses and lighter weight bolt carrier groups and buffer systems than straight blowback systems could deliver. Check out our CMMG Resources article & video to learn more about what sets Radial Delayed Blowback apart.

Radial delayed blowback was an advancement from straight blowback. Compact action radial delayed blowback was an advancement to the original radial delayed blowback. This (fixed ejector on radial delayed blowback) is a continued advancement bringing new technologies to the original platform. 

MkG .45 ACP uppers are only designed for use with MkG lowers, other manufacturers’ lowers may work but CMMG® cannot guarantee function.

Lifetime Quality Guarantee

We aim to please, that’s why every CMMG product is backed by our Lifetime Quality Guarantee against material and workmanship defects. Learn More.