The Pre-Owned CMMG MK-57 5.7x28 Banshee-style pistol offers a compact AR-platform build with familiar controls and a short barrel topped by a flash hider. Built on CMMG’s dedicated MK57 lower that accepts 5.7x28 magazines, this semi-automatic pistol features a free-floating handguard with multiple slots and a full-length Picatinny rail for mounting optics or accessories.

This configuration is well suited for range use, training, and general recreational shooting where a soft-recoiling, high-velocity cartridge is desired. The brace-equipped rear end and ergonomic pistol grip support stable handling in a compact footprint. As a pre-owned firearm, it provides an opportunity to step into CMMG’s innovative 5.7x28 platform at a more accessible price while still benefiting from the company’s reputation for thoughtful engineering and reliable performance.

Key Features:

• Manufacturer: CMMG
• Model: MK-57
• Caliber: 5.7x28
• Condition: Pre-Owned
• Action: Semi-Automatic
• Barrel Length: Short Barrel With Flash Hider
• Number of Magazines: 1
• Capacity: 20 Rounds
• Threaded Barrel: Yes
• What's In The Box: Firearm, Magazine