CMMG Banshee MK4 5.7x28mm 5″ 40+1

The CMMG Banshee MK4 is an ultra-compact AR-style pistol chambered in 5.7 x 28 mm with a 5″ barrel that keeps overall length minimized for tight spaces and convenient handling. Built on the MK4 AR15 platform, it uses a standard AR15 lower receiver and CMMG AR conversion magazines for reliable compatibility. The pistol features an EML4 M-LOK handguard with slots at 3, 6, and 9 o’clock plus a full-length Picatinny top rail and integrated handstop to support accessories and control. Mechanical controls include an ambidextrous safety lever and CMMG Zeroed grips to suit a range of shooters.

Key Specifications

• The caliber is 5.7 x 28 mm.
• The action is Semi-Auto.
• The barrel length is 5 inches.
• The capacity is 40 + 1.
• The barrel finish is Black Nitride medium taper threaded.
• The handguard is EML4 M-LOK with an integrated handstop and accessory slots.
• The receiver includes a full-length Picatinny rail on top for sights and optics.
• The grip is CMMG Zeroed.
• The weight is 4.80 lbs.
• The safety is an Ambidextrous Safety Lever.

Designed for users who prioritize compactness and control, the Banshee MK4 delivers a nimble platform for range work and close-quarters scenarios where a short overall length and light weight matter. Its M-LOK handguard and Picatinny rail make accessorizing straightforward, while the high-capacity magazine option preserves sustained use between reloads. For shooters seeking a compact AR-platform pistol in 5.7x28mm with modern ergonomics and accessory-ready features, this configuration presents a balanced, capable choice.

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