The CMMG Banshee Mk57 (CMMG part no. 57AF60FAB) is built around the 5.7x28mm cartridge, a flat-shooting, low-recoil round that has become a favorite for personal defense. Its 8-inch barrel is sized to pull maximum velocity out of the 5.7x28mm case, and the platform runs FN Five-seveN pattern magazines with an oversized mag release for fast reloads. Even with pistol-caliber magazines feeding the gun, CMMG engineered the Mk57 for reliable cycling shot after shot. Finished in armor black, it’s a compact, easy-shooting option for home defense or the range.

Key Specifications

• Chambered in 5.7x28mm, a flat-shooting round known for high velocity and light recoil.
• Runs an 8-inch barrel sized to extract strong velocity from the 5.7x28mm cartridge.
• Compatible with FN Five-seveN pattern magazines, giving you a proven, widely available feeding source.
• Features an oversized mag release for quick, positive reloads under pressure.
• Finished in armor black for a durable, low-maintenance exterior.
• Built on CMMG’s Banshee platform, sharing controls and ergonomics with the rest of the lineup.

Frequently Asked Questions

What magazines does the Banshee Mk57 use? It runs FN Five-seveN pattern magazines, a proven and widely available option for the 5.7x28mm cartridge.

What makes 5.7x28mm a good defensive caliber? It’s a flat-shooting, high-velocity round with noticeably lighter recoil than most centerfire pistol calibers.

Is reloading fast on this pistol? Yes, an oversized mag release is built in for quick, positive magazine changes.

Buy the CMMG Banshee Mk57 Pistol, 5.7x28mm, 8-Inch, Armor Black

The Mk57 gives shooters a serious personal-defense platform without the recoil that comes with heavier calibers. Feeding off proven Five-seveN pattern magazines means ammo and mag capacity are never a bottleneck. Order it from our AR pistols lineup at our Lubbock, Texas gun shop for fast, insured shipping to your FFL.