The CMMG Banshee Mk4 FourSix pistol in 4.6x30mm (brand part no. 46A870DAB) is the first AR-platform firearm chambered in 4.6x30mm ever released to the U.S. civilian market, reimagining the personal defense weapon with light recoil and a 40-round magazine capacity. CMMG cuts the 8-inch barrel to a 1-in-5.9 twist and cycles the FourSix by direct impingement, topping the muzzle with a CMMG Zeroed linear compensator threaded 1/2×28. The pistol wears a CMMG EML7 M-LOK handguard and a CMMG RipBrace, with a Zeroed ambidextrous charging handle and a Zeroed drop-in single-stage trigger for fast, precise follow-up shots. Among AR pistols, the FourSix favors shooters who want a genuinely novel personal-defense caliber on a familiar AR-pattern platform.

Key Specifications

• The chambering is 4.6x30mm, a first for the U.S. civilian market.
• The magazine holds 40 rounds.
• The barrel measures 8 inches with a 1-in-5.9 twist.
• The operating system is direct impingement.
• The muzzle device is a CMMG Zeroed linear compensator, threaded 1/2×28.
• The handguard is a CMMG EML7 M-LOK design.
• A CMMG RipBrace ships installed.

Frequently Asked Questions

Is 4.6x30mm common in the U.S.? No, this FourSix is the first 4.6x30mm AR-platform firearm ever released to the U.S. civilian market.

How many rounds does the magazine hold? 40 rounds per magazine.

Buy the CMMG Banshee Mk4 FourSix Pistol

A genuinely new personal-defense caliber, light recoil, and a 40-round magazine make this FourSix unlike anything else in an AR pistol. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.