The CMMG Banshee Mk4 (CMMG part no. 30AF20ACT) chambers .300 Blackout, a compact and capable cartridge designed to be right at home in AR15-pattern firearms like CMMG’s Mk4 platform. Originally created for optimum performance in subsonic, suppressed, and short-barrel applications, .300 Blackout is a natural fit for this 8-inch-barreled pistol. A quick-deploy RipBrace ships installed, and the EML handguard features full-length M-LOK slots on both sides and the bottom, plus additional M-LOK sections between the top Picatinny rail segments. This Banshee includes a full slate of Mk4 Zeroed parts and ships with a 30-round Magpul PMAG. Finished in CMMG‘s coyote tan Cerakote, it’s built for shooters who want genuine .300 Blackout versatility in a compact package.

Key Specifications

• Chambered in .300 AAC Blackout, originally designed for optimum performance in subsonic, suppressed, and short-barrel applications.
• Runs an 8-inch threaded barrel for a compact, maneuverable footprint.
• Holds 30 rounds per magazine, and ships with a 30-round Magpul PMAG included.
• Includes a quick-deploy CMMG RipBrace for a stable shooting platform.
• Wears a full-length EML M-LOK handguard with mounting slots on both sides, the bottom, and between the top rail sections.
• Includes a full slate of Mk4 Zeroed parts for consistent fit and finish.
• Ships optics-ready with no fixed sights, leaving the top rail open for a red dot.
• Cycles in reliable semi-auto for controlled, repeatable follow-up shots.
• Finished in coyote tan Cerakote for a distinctive, durable exterior.

Frequently Asked Questions

What makes .300 Blackout well-suited to this platform? It was originally designed for optimum performance in subsonic, suppressed, and short-barrel applications, all common uses for a compact AR pistol.

Does it include a brace? Yes, CMMG’s quick-deploy RipBrace ships installed.

Does it come with a magazine? Yes, a 30-round Magpul PMAG ships with the pistol.

Buy the CMMG Banshee Mk4 Pistol, .300 Blackout, 8-Inch, Coyote Tan

This Mk4 Banshee pairs one of the most versatile modern cartridges with a genuinely compact AR pistol platform, all backed by CMMG’s Zeroed parts kit. Order it from our AR pistols lineup at our Lubbock, Texas gun shop for fast, insured shipping to your FFL.