Description
There is something to be said for an AR pistol you can feed all afternoon without wincing at the ammo bill. The CMMG Banshee MK4 in .22 LR is built for exactly that. It looks, handles, and controls like a centerfire AR-15, but it runs on the cheapest, softest-shooting cartridge on the shelf. That makes it a natural for new shooters getting comfortable with the platform, seasoned folks who want honest trigger time on a budget, or anyone who just enjoys turning a brick of rimfire into a good time.
Real AR Controls on the Banshee MK4
CMMG did not cut corners just because this one is a rimfire. The Banshee MK4 comes loaded with their Zeroed parts package, including a drop-in trigger, a 60/90 degree ambidextrous safety, an ambi charging handle, ambi mag catch with an extended release button, and a Zeroed pistol grip. Everything sits where it would on a full-size AR, so the muscle memory you build here carries straight over to your 5.56 rifle. Lefties get a fully workable setup too, which is rarer than it should be in this category.
Handguard, Barrel, and Finish Details
The 9-inch barrel wears a threaded muzzle with a flash hider, and the EML handguard gives you full-length M-LOK slots along the sides and bottom plus Picatinny sections up top for optics, lights, or a sling mount. The whole package is finished in durable Armor Black Cerakote and weighs in around 4.9 pounds with a 24.7-inch overall length, so it stays quick and easy to handle. This version ships with a standard pistol buffer tube out back.
Feeding the Banshee .22 LR
In the box you get one of CMMG's 25-round .22 LR conversion magazines, and spares are easy to come by if you want to keep the pace up. CMMG backs the whole thing with their Lifetime Quality Guarantee, and everything is made in the USA. If you have been wanting a rimfire that does not feel like a toy, this is the one to handle.
Key Specifications
- Manufacturer: CMMG
- Model: Banshee MK4
- MPN: 22AC40FAB
- UPC: 810144722351
- Caliber: .22 LR
- Action: Semi-Auto
- Barrel Length: 9 inches, threaded with flash hider
- Capacity: 25+1
- Overall Length: 24.7 inches
- Weight: 4.9 lbs
- Safety: CMMG Zeroed 60/90 degree ambidextrous
- Handguard: CMMG EML with M-LOK slots and Picatinny rail
- Finish: Armor Black Cerakote
- Trigger: CMMG Zeroed drop-in trigger
- Brace/Tube: Pistol buffer tube
What’s Included
- CMMG Banshee MK4 .22 LR pistol
- One CMMG 25-round .22 LR magazine
- CMMG Lifetime Quality Guarantee
Frequently Asked Questions
Is the CMMG Banshee MK4 .22 LR a conversion kit or a dedicated rimfire?
It is a complete, dedicated .22 LR pistol from the factory, not something you assemble yourself. The upper is purpose-built for rimfire and pairs with CMMG's MK4 lower, and it feeds from CMMG's 25-round .22 LR conversion-style magazines. You get the full AR look and feel without any tinkering.
Are the controls on the Banshee MK4 the same as a standard AR-15?
Yes, and that is one of its biggest strengths as a trainer. The safety, mag release, bolt catch, and charging handle all sit in the familiar AR positions, and most of them are ambidextrous thanks to the Zeroed parts package. Skills you practice on this pistol transfer directly to a centerfire AR.
Can I mount an optic and accessories on the Banshee MK4?
Absolutely. The upper receiver and handguard have Picatinny rail sections up top for a red dot or scope, and the EML handguard runs M-LOK slots along the sides and bottom for lights, lasers, or a hand stop. It does not ship with sights, so plan on adding an optic or a set of backup irons.
Is the barrel on the CMMG Banshee MK4 .22 LR threaded?
Yes, the 9-inch barrel has a threaded muzzle and comes with a flash hider installed from the factory. That makes it easy to swap on a different muzzle device if you prefer. Rimfire ammo tends to run dirty, so plan on regular cleaning to keep it cycling at its best.



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