The CMMG Banshee Mk4 pistol (brand part no. 94A8C0FMB) is an ultra-compact 9mm AR-pattern pistol built on CMMG’s Mk4 platform, pairing a 5-inch 4140 chrome-moly barrel with a Bronze Cerakote finish for a rig sized for close-range defense and easy transport. CMMG runs a fixed-ejector radial delayed blowback operating system for reliable cycling in a short-barrel 9mm host, and the B5 Systems Bravo brace mounts to a 6-position CMMG Fastback receiver extension for a stable, adjustable shooting platform. Among semi-auto handguns, this Banshee configuration favors shooters who want a genuinely compact 9mm AR pistol without stepping up to a full-size carbine.

Key Specifications

• The chambering is 9mm.
• The barrel measures 5 inches, built from 4140 chrome-moly steel with a nitride finish.
• The rate of twist is 1:10.
• The operating system is fixed-ejector radial delayed blowback, tuned for short-barrel reliability.
• The muzzle wears a ZEROED RBB brake threaded 1/2×28.
• The M-LOK handguard is CMMG’s EML4, with slots at 3, 6, and 9 o’clock.
• The upper and lower receivers are billet and forged 7075/6061 aluminum.
• The brace is a B5 Systems Bravo Stock mounted on a 6-position receiver extension.
• The finish is Bronze Cerakote.
• It ships with a 30-round CMMG magazine.

Frequently Asked Questions

Is this a pistol or an SBR? It is a pistol; the B5 Systems Bravo brace mounts to the receiver extension without a shoulder stock, so no NFA paperwork is required.

What magazines does it use? It ships with a CMMG 30-round 9mm magazine.

Is the handguard M-LOK compatible? Yes, the EML4 handguard has M-LOK slots at 3, 6, and 9 o’clock for accessories.

Buy the CMMG Banshee Mk4 Pistol

A genuinely compact 9mm AR pistol with a stable brace and a 30-round magazine is exactly what this Banshee Mk4 delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.