CMMG Banshee MK4 .300 AAC Blackout 12.5in Pistol – Black

The CMMG Banshee MK4 is an AR-platform pistol built on CMMG’s Mk4 receivers and chambered in .300 AAC Blackout. It uses a 12.5-inch threaded barrel and is configured for short-barrel and suppressed applications, while maintaining AR-style ergonomics and accessory compatibility. The pistol ships with CMMG ZEROED components including the trigger, pistol grip, and RipBrace pistol brace. Full M-LOK capability and a Picatinny optic footprint provide flexibility for optics and accessories.

Key Specifications

• The caliber is .300 AAC Blackout.
• The action type is Semi-Auto.
• The barrel length is 12.5 inches and it is threaded.
• The barrel material is 4140 CM.
• The muzzle is threaded 5/8×24.
• The included muzzle device is a CMMG Zeroed Linear device.
• The handguard provides M-LOK attachment slots for accessories.
• The factory magazine capacity is 30 rounds and the package includes 1 magazine (Magpul 30rd PMAG noted in product materials).
• The finish is listed as Cerakote Armor Black.
• Controls include an ambidextrous safety and a CMMG Zeroed ambidextrous charging handle.

Compact, configurable, and built around the Mk4 AR platform, the Banshee MK4 gives you a short-barrel option that retains modularity and accessory support. Its threaded 12.5″ barrel and M-LOK-ready handguard make it suitable for suppressed or compact setups, and ZEROED components reduce the need for immediate upgrades. For users seeking a compact AR-pattern pistol with factory configuration for short-barrel and suppressed roles, this Banshee MK4 presents a straightforward, well-specified option.

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