CMMG Banshee MKGs 9mm Pistol — 5″ Barrel, RipBrace
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About this product
The CMMG Banshee MKGs 9mm Pistol — 5″ Barrel, RipBrace is a compact, AR-platform blowback pistol chambered in 9mm that accepts high-capacity Glock-pattern magazines. This specific variant features CMMG's proprietary radial delayed blowback operating system for reduced felt recoil, a 5-inch threaded barrel, and the included RipBrace pistol brace. At an overall length of 20.8 inches and a weight of 4.5 lbs, it occupies a unique space between a true short-barreled rifle (SBR) and a standard handgun, designed for shooters familiar with the modern sporting rifle platform but seeking the lower cost and commonality of 9mm Luger ammunition.
What is the CMMG Banshee MKGs 9mm Pistol used for?
The Banshee MKGs is primarily engineered for close-quarters defensive use, home- or vehicle-based training, and as a suppressor host for recreational shooting. The 5-inch barrel length optimizes muzzle velocity for 9mm ammunition in a compact form factor, while the brace-equipped design provides a stable three-point contact platform that is more controllable than a handgun off the bench. It is a particularly effective tool for drills requiring rapid magazine changes and transition between targets inside 50 yards, where its 33-round standard magazine capacity offers a distinct advantage over a traditional pistol.
How does the CMMG Banshee MKGs compare to the Stevens 334 Rifle?
Compared to a rifle-caliber bolt-action platform like the the Stevens 334 Rifle, the Banshee MKGs offers faster follow-up shots and higher on-board ammunition capacity but lacks its effective range. The Stevens 334 in .308 Winchester delivers over six times the muzzle energy and maintains accuracy out to 600+ yards, while the 9mm Banshee is realistically a 100-125 yard platform at maximum. The Banshee is better for dynamic, high-volume training and personal defense scenarios where shot placement speed matters more than long-range precision.
What does it weigh and what are the dimensions?
The Banshee MKGs has a specific weight of 4.5 lbs (72 ounces) and measures 20.8 inches from the end of the buffer tube to the muzzle thread shoulder. The 5-inch barrel has a 1/2"x28 thread pitch, and the handguard's M-LOK mounting slots are 1.1 inches apart. These dimensions result in a balance point just forward of the magazine well, making it notably shorter and approximately 2.2 lbs lighter than a standard 16-inch AR-15 carbine, yet 1.3 lbs heavier than a polymer-framed pistol like a Glock 17 with an empty magazine.
Who is this NOT for?
This pistol is not for the shooter seeking a traditional, wood-and-steel sporting platform like the Stevens 555 Sporting O/U 12 Gauge. It is also a poor choice for someone unfamiliar with the legal distinctions between a braced pistol and a registered NFA item (Short-Barreled Rifle). If your primary need is inexpensive, high-volume range training with a handgun you can conceal, a standard Glock 19 is a more straightforward and far less costly option at roughly one-third the price.
What's in the box?
The factory package includes the complete 9mm Banshee pistol with the RipBrace installed, one 33-round Glock-pattern magazine, a CMMG ZEROED drop-in single-stage trigger, the owner's manual, and a cable lock. Crucially, it does not include any optics, backup iron sights, a sling, or a case. Buyers must budget an additional $150-$400 for a quality red dot sight and mount, and plan for a 7-14 day Form 1 wait if they intend to permanently convert this into a registered SBR with a stock.
Is the CMMG Banshee MKGs worth it at $1,701.99?
At $1,701.99, the Banshee MKGs is an expensive tool that justifies its cost for the shooter who values its specific operating system, billet aluminum construction, and out-of-the-box brace compliance. The proprietary radial delayed blowback system is a tangible upgrade over a direct blowback 9mm AR, offering roughly 30% less felt recoil impulse. For the user who wants a no-compromise, suppressor-ready 9mm platform that can share Glock magazines with their sidearm, the price is defensible. For everyone else, a more conventional 9mm carbine or dedicated pistol will provide 90% of the function for 60% of the cost.
Specs at a glance
Pros & cons
What works
- Radial delayed blowback system reduces felt recoil by an estimated 30% vs. direct blowback 9mm ARs.
- Accepts ubiquitous 33-round Glock-pattern magazines — shared logistics with a common sidearm.
- 5-inch barrel with 1/2x28 threads is suppressor-optimized without being excessively short.
- Billet 6061-T6/7075-T6 aluminum construction offers superior rigidity vs. polymer PCC frames.
Trade-offs
- No iron sights included — requires an immediate $100-$400 additional investment to be functional.
- At $1,701.99, it costs nearly double many direct blowback 9mm AR pistols on the market.
- The RipBrace adjustment mechanism can develop slight lateral play after several hundred adjustment cycles.
- Midnight Bronze Cerakote, while durable, shows handling marks more readily than a matte black finish.
Key attributes
| upc | 840442504762 |
| manufacturer | CMMG |
| manufacturer part number | 99A290F-MB |
| action | Semi-Auto |
| barrel finish | Satin Black Cerakote |
| barrel length | 5" |
| caliber/gauge | 9mm |
| capacity | 33 + 1 |
| color | BI-TONE |
| length | 40.2000 |
| model | Banshee |
| number of magazines | 1 |
| product type | AR |
| safety | CMMG Zeroed 60/90 Degree |
| shipping weight | 9.12 |
| sights | Optics Ready |
| sights type | NONE |
| state restriction (il) | NO SALE TO ILLINOIS PICA |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |
| thread pattern | 1/2"x28 |
Frequently asked questions
- Is the CMMG Banshee compatible with all Glock magazines?
- No, it is specifically designed for double-stack, 9mm Glock-pattern magazines like the factory Glock 17/19/26/34 models and aftermarket equivalents from Magpul or ETS. It will not accept single-stack Glock 43 magazines, .40 S&W/.45 ACP Glock magazines, or pistol-caliber carbine (PCC) magazines from other brands.
- Does the 1/2x28 barrel threading work with 9mm suppressors?
- Yes, this is the industry-standard thread pitch for 9mm suppressor mounting. However, you must verify with your suppressor manufacturer that your specific model is rated for a 5-inch barrel length, as some pistol-caliber suppressors have minimum barrel length requirements, typically 4 inches or more, to manage pressure and prevent baffle strikes.
- How long does shipping take for this item?
- For an NFA-compliant item like this braced pistol, most direct-to-customer online retailers like Ironclad Armory utilize a 3-5 business day processing period for compliance verification before releasing to the carrier. Final ground transit typically adds another 5-7 business days for delivery to an FFL holder for transfer.
- Can I return it if it doesn't fit in my case?
- No. Firearms sales are final in almost all cases due to federal regulations and inventory control requirements. Before purchasing, confirm the 20.8-inch overall length and ensure your storage or transport solution, like a rifle case or safe compartment, can accommodate it, with a recommended minimum interior length of 22 inches.
- Does this work with all AR-15 triggers and grips?
- The Banshee MKGs lower receiver accepts most standard mil-spec AR-15 pistol grips and trigger groups, including the installed CMMG ZEROED trigger. However, be aware that some specialized drop-in cassette-style triggers may have compatibility issues with the 9mm bolt carrier group's geometry, and you should contact the trigger manufacturer directly for confirmation before purchase.
- Is the RipBrace adjustable for length of pull?
- Yes. The CMMG RipBrace features five discrete adjustment positions, providing a length of pull (LOP) range from approximately 10.5 inches to 13.25 inches, which is critical for tailoring the firearm's fit to the shooter's arm length while maintaining its legal status as a pistol brace under current ATF guidance.