CMMG announces the first firearm made for the American consumer market chambered in 4.6x30mm. Meet the CMMG FourSix.

Originally designed for the HK MP7 in the 1990s for a low-recoiling NATO Personal Defense Weapon program, the 4.6x30mm is a rimless bottlenecked cartridge that displays some outstanding terminal ballistics at distances out to 150 yards.

With the HK MP7 being the only firearm with this cartridge, you were required to hold a current SOT license to get one. That was then. This is now.

CMMG Unveils the FourSix in 4.6×30mm
Photo: CMMG

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Here’s what CMMG has to say about the FourSix

CMMG is proud to announce the release of the FourSix, the first ever line of ARs to hit the civilian market that are chambered in 4.6x30mm. With an impressive 40-round magazine capacity, light recoil and penetrating power at close distances, CMMG’s FourSix is here to reimagine the Personal Defense Weapon.

First introduced in 1999, the 4.6x30mm is known for its pairing with the Heckler & Koch MP7. By design, the 4.6x30mm is a relatively small and lightweight cartridge with minimal felt recoil meant to compete with the 5.7x28mm. There has never been a 4.6x30mm-chambered firearm released in the U.S. market until now.

CMMG’s FourSix is built on the company’s Mk4 platform which features AR15 controls and modularity. Best of all, the 40-round FourSix magazines seat into a standard AR15-sized magwell, which means users can pair their existing AR15 lower receiver with a CMMG FourSix upper receiver and magazine.

CMMG’s BANSHEE is the ultimate Personal Defense Weapon (PDW). The BANSHEE’s lightweight and compact design pairs well with the soft-shooting 4.6x30mm cartridge to create a very controllable and portable firearm for almost any shooter. The FourSix operates on a modified direct impingement system, offering Last Round Bolt Hold Open and is fed from a proprietary 40-round CMMG FourSix Magazine.

If you plan on building your own customized AR15 in 4.6x30mm, CMMG has a solution for that too. CMMG’s Barrel and BCG (bolt carrier group) kits make it easy to build an AR15 in 4.6x30mm. Because CMMG has slightly modified the BCG to reliability cycle 4.6x30mm ammunition you’ll need to use their BCG, barrel and the CMMG FourSix Magazine to ensure your build functions correctly.

MSRP on either model starts at $1,399. Spare mags are going to run you roughly $39. There’s no price or availability on standalone FourSix uppers yet.

The only drawback at this time is the problem of finding 4.6×30 ammo. Hopefully, with CMMG releasing the FourSix chambered in this round, other gun manufacturers will follow suit, resulting in ammunition manufacturers taking notice and introducing the 4.6×30 into their production lines.

Currently, only Sellier & Bellot and Fiocchi market 4.6mm loads for the United States, and they are both FMJ cartridges.

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