Big Capacity for the new CMMG Banshee – Kriss MagEx 12+

CMMG just put the extra short in “short barrel rifle.” With the launch of the Banshee lineup, the company is bringing compact and handy to a whole new level.

The CMMG Banshee is a family affair, with members currently identifying as .45 ACP, .22 LR, 300 Blackout, and 9mm. Perhaps we’ll see more caliber offerings if the Banshee takes off. Oh, it comes in an official short barrel rifle configuration (NFA Tax Stamp required) and a pistol version. I’ve had the pistol variant of the .45 ACP Banshee for the past month or so running it through its paces.

It’s short. Really short. This one uses a five-inch barrel with a hand guard that’s just a hair longer than my hand itself. It’s got a threaded barrel, so it just screams for the addition of a suppressor. OK. I went ahead and stuck a SilencerCo Osprey 45 on it. It pairs well and looks dashing. Not to mention, it’s ultra-quiet as most .45 ACP loads are naturally subsonic.

The Banshee looks like a classic AR-type rifle, and in the 300 Blackout variant it is. The pistol caliber models use a rotary delayed blowback system, so there’s no gas tube. The bolt and carrier look similar, but the bolt has an internal spring to help put things back into battery.

A factory Glock 21 magazine and one with the Kriss MagEx 12+ installed.
A factory Glock 21 magazine and one with the Kriss MagEx 12+ installed.

The Banshee uses standard Glock 21 magazines. This is good as they’re readily available and proven reliable. The bad part is that they only hold 13 rounds, plus one in the chamber if you like. That’s not shabby in a pistol, but in a firearm like this one, you immediately want more. This Banshee would make for an excellent bedside companion or car/truck accessory, so I’d prefer to load it up. Anyway, Glock doesn’t make larger magazines, but the Kriss folks do – sort of. The MagEx.

An inner and outer sleeve provide the extension with plenty of stability.
An inner and outer sleeve provide the extension with plenty of stability.

The Kriss MagEX 12+ Extension kit converts an existing Glock magazine into a 25-round version that so far in my testing has been utterly reliable and solid. Here’s how it works. You take the base plate off the factory magazine an extended and outer sleeve, mate the original and two Kriss parts to create one big magazine. Kriss provides an extra-long spring to make it work.

It’s a great system, and the best part is that if you don’t like it, you can easily revert to the original factory configuration – nothing is modified or damaged in the conversion. If you want a preconfigured solution, you can also buy the assembled version which includes the factory Glock 21 magazine.

Tom McHale is a committed learning junkie always seeking a new subject victim. As a lifelong student of whatever grabs his attention on any particular day, he thrives on beating rabbit trails into submission. In between his time as a high-tech marketing executive, restaurant owner, and hamster cosmetology practitioner, he's published seven books and nearly 1,500 articles about guns, shooting, and the American way.

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