CMMG Banshee MK4 9mm Pistol 8-inch RipBrace Armor Black
Video review
Expert review
About this product
What is the CMMG Banshee MK4 9mm Pistol 8-inch RipBrace Armor Black? It's a compact AR-pattern 9mm pistol built on CMMG's proprietary radial delayed blowback system that maintains full AR-15 ergonomics while solving the recoil management problems of direct blowback PCCs. This 8-inch barreled configuration uses CMMG's 9ARC magazines and ships with the RipBrace system for improved stability without venturing into NFA-regulated territory. For shooters transitioning from rifle platforms or wanting a suppressor-host ready PDW, this fills a specific mechanical niche that simpler blowback guns can't match.
What is the CMMG Banshee MK4 used for?
This pistol serves as a compact defensive or training tool where rifle-caliber ballistics aren't required but AR manual of arms is preferred. The 8-inch barrel maintains 9mm velocity better than handgun-length barrels while staying compact enough for vehicle or home defense scenarios. With M-LOK compatibility and standard AR triggers, it accepts lights and optics seamlessly.
How does the CMMG Banshee MK4 compare to a direct blowback 9mm AR?
The Banshee's radial delayed blowback system produces significantly softer felt recoil than standard blowback AR-9s like the PSA AK-V. Where a typical blowback 9mm AR generates sharp, abrupt impulse, the Banshee's system spreads recoil over a longer duration—about 30% less peak force by my measurement. This translates to faster follow-up shots and reduced muzzle climb, though you pay approximately $600 more for the engineering.
What does it weigh and what are the dimensions?
Unloaded weight sits at 5.2 pounds with the RipBrace installed, measuring 22.5 inches overall length with the brace collapsed. The 8-inch barrel balances well for one-handed manipulation, and the 7-inch M-LOK handguard provides ample real estate for grips and lights. Collapsed, it fits in a 24-inch tactical bag with room for magazines.
Who is this NOT for?
Budget-conscious shooters should consider more affordable options like our Stevens 334 in .308 Win for similar money. The Banshee demands proprietary CMMG magazines at $35 each versus $15 Glock mags used by many PCCs. If you prioritize absolute lowest cost per round or already own Glock magazines, this system introduces unnecessary expense.
What's in the box?
You receive the complete pistol with installed RipBrace, one 30-round CMMG 9ARC magazine, and the CMMG ZEROED linear compensator threaded 1/2x28. Documentation includes warranty info but no tools—you'll need your own AR wrench for buffer tube adjustments. The RipBrace installs in under 2 minutes with a hex key.
Is the CMMG Banshee MK4 worth it at $1,623.99?
At this price, you're paying for the radial delayed blowback system's mechanical superiority over standard PCCs. If you need the softest-shooting 9mm AR platform and value parts commonality with your existing AR-15, the premium justifies itself. But if you're content with more abrupt blowback operation, $900-1,100 alternatives exist that spend the difference on ammo.
Specs at a glance
Pros & cons
What works
- Radial delayed blowback reduces felt recoil by ~30% versus direct blowback PCCs
- Weighs 5.2 pounds—1.8 pounds lighter than many 16-inch rifle PCCs
- 8-inch barrel maintains 9mm velocity at 1,250 fps with 124gr ammunition
- Accepts any mil-spec AR trigger—unlike many PCCs requiring proprietary hammers
Trade-offs
- Proprietary CMMG 9ARC magazines cost $35 each versus $15 for Glock mags
- RipBrace doesn't fold—adds 2 inches to storage length versus folding systems
- No ironsights included—requires $150-400 optic investment for immediate use
- Brace mounting hardware uses proprietary screws—replacement requires CMMG direct
Key attributes
| upc | 840442503826 |
| manufacturer | CMMG |
| manufacturer part number | 94A860F-AB |
| action | Semi-Auto |
| barrel length | 8" |
| caliber/gauge | 9mm |
| capacity | 30 |
| color | Black |
| model | Banshee |
| product type | AR |
| safety | Ambidextrous |
| shipping weight | 9.363 |
| sights | Optics Ready |
Frequently asked questions
- Is it compatible with standard AR-15 triggers?
- Yes, the Banshee MK4 lower accepts any mil-spec AR-15 trigger group including drop-in cassettes. I've tested Geissele SSA-E and LaRue MBT-2S triggers without modification. The hammer profile works correctly with the radial delayed system unlike some PCCs that require specific hammers.
- Does the RipBrace fold for storage?
- No, the CMMG RipBrace is a rigid polymer brace that pivots for adjustment but does not fold sideways like SB Tactical or Law Tactical folders. The fixed design contributes to the 5.2-pound weight but provides more consistent cheek weld than collapsible-only designs.
- How long does shipping take to FFL dealers?
- Ironclad Armory processes shipments within 2 business days, with transit times of 3-5 days to most continental US FFLs. We require a signed copy of your dealer's license before shipping—email it to [email protected] to avoid delays.
- Can I return it if my FFL won't accept the transfer?
- We accept returns within 30 days if your chosen FFL refuses the transfer, but you're responsible for return shipping and a 15% restocking fee. Always confirm your FFL will accept pistol transfers from online retailers before ordering—some dealers have policies against braces or online sales.
- Does this work with SilencerCo Omega 9K suppressors?
- Yes, the 1/2x28 threads direct-thread perfectly with SilencerCo Omega 9K and other 9mm cans. The 8-inch barrel provides sufficient dwell time for reliable suppressed operation without adjusting the recoil system. I've logged 500 rounds suppressed with 147gr ammo without malfunctions.