NRA Gun of the Week: CMMG Mk57 Banshee

American Rifleman Staff

posted on November 17, 2018

Support NRA American Rifleman DONATE

** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. **

Most who know the 5.7x28 mm cartridge don’t know that CMMG Inc., a U.S. manufacturer, is chambering an AR-pistol to operate the Belgian-designed “Five-Seven” cartridge. The Mk57 Banshee pistol, featured here, operates different than the typical Stoner, gas-operated design. This Slate Gray-Cerakoted, 4 1/2-lb. pistol, built from both forged and billet aluminum, utilizes a delayed form of cartridge blowback termed "radial-delayed" by the manufacturer. To find out more, watch this week's NRA Gun of the Week video hosted by Kelly Young.

Specifications:
Model: Mk57 Banshee
Manufacturer: CMMG Inc.
Chambering: 5.7x28 mm
Action Type: radial-delayed, blowback-operated center-fire pistol
Lower Receiver: 7075-T6 billet aluminum
Upper Receiver: 7075-T6 forged aluminum
Barrel: 5”; threaded 1/2x28 TPI, includes thread protector
Trigger: 5-lb, 7-oz. pull
Finish: Cerakote, Slate Gray
Magazine: 20-round detachable box
Weight: 4 lbs., 9 ozs.
MSRP: $1,550

Additional Reading:
SHOT Show 2018: CMMG Mk4 DTR2 .224 Valkyrie Rifle
Tested: CMMG MK4 Banshee .22 LR Pistol
Tested: CMMG Guard Pistol Caliber Carbines
Tested: CMMG MkW-15 XBE Anvil

Latest

TriStar Arms Protégé X: A Pocket-Size Punch

Inspired by successful designs of the past, the TriStar Arms Protégé X is a pocket-size, M1911-style handgun chambered for the popular 9 mm cartridge.

Reviews, News

Hornady Family Honored with Legacy Award

In October, the Hornady family was recognized by the Greater Grand Island Community Foundation for its contribution to the city that Hornady calls home.

News

I Have This Old Gun: Model 1860 Spencer Carbine

One of the most revolutionary shoulder arms of the American Civil War, the Model 1860 Spencer carbine went from being an experimental design at the war's beginning to ultimately becoming the official issue arm of the U.S. Cavalry by war's end.

News, ARTV

New For 2025: Tippmann Arms Integrally Suppressed M4-22s

In anticipation of the upcoming $0 NFA tax stamp enactment, Tippmann Arms is now offering integrally suppressed versions of its M4-22 design.

News, Guns

Favorite Firearms: A Winchester Model 54 Turns 100

Serving during World War I in 1918, my father completed two years in the Engineer Corps. In addition to his engineering duties, he and all the other soldiers had to carry and qualify with the Model 1903 Springfield rifle, since they were often on the front lines.

News, Bolt-Action Rifles

Winchester Ammunition Opens New Office In Missouri

Winchester Ammunition opened a new office in Clayton, Mo., which will accommodate much of the company's full-time administrative staff and is located several hours away from the Lake City Army Ammunition Plant.

News, Ammunition