CMMG Banshee Mk4 5.56 NATO 10.5in 30rd Midnight Bronze
Pros & cons
What works
- Radial delayed blowback reduces recoil by 30% compared to direct impingement AR pistols
- 10.5-inch barrel maintains 2700 fps muzzle velocity with 55gr ammunition
- M-LOK handguard provides 18 slots for accessory mounting without adding weight
- Midnight Bronze Cerakote adds corrosion resistance and weighs only 0.1oz additional
Trade-offs
- Pistol brace configuration subject to changing ATF regulations requiring compliance monitoring
- 10.5-inch barrel produces significant muzzle blast - 165dB unsuppressed
- No iron sights included - adds $100-200 for backup sight system
- Single magazine included necessitates additional $15-25 per magazine purchases
Video review
Expert review
Specs at a glance
About this product
What is the CMMG Banshee Mk4 5.56 NATO 10.5in 30rd Midnight Bronze?
The CMMG Banshee Mk4 is a purpose-built AR-pattern pistol chambered in 5.56 NATO with a 10.5-inch barrel and RipBrace pistol brace. This configuration bridges the gap between compact maneuverability and rifle-caliber terminal performance, utilizing CMMG's proprietary radial delayed blowback system that reduces felt recoil by approximately 30% compared to direct impingement systems. The Midnight Bronze Cerakote finish provides both corrosion resistance and a distinctive aesthetic that holds up against abrasive handling.
What is the CMMG Banshee Mk4 used for?
The Banshee Mk4 serves as a compact defensive platform ideal for vehicle-based operations or confined space scenarios where full-length rifles are impractical. With its 10.5-inch barrel maintaining 5.56 NATO terminal effectiveness out to 200 yards, this platform offers reliable performance in a package that measures just 26.5 inches overall length with the brace collapsed. The M-LOK handguard accepts lights, lasers, and vertical grips while the Picatinny top rail accommodates optics up to 5.5 inches in length.
How does the CMMG Banshee Mk4 compare to the Stevens 334 Rifle?
The Banshee Mk4 offers significantly faster follow-up shots and higher capacity compared to bolt-action rifles like the Stevens 334 in .308 Win, though it sacrifices long-range precision beyond 300 yards. Where the Stevens 334 delivers sub-MOA accuracy at 100 yards with match ammunition, the Banshee's 10.5-inch barrel produces 2-3 MOA groups with M193 ball ammunition but provides 30-round magazine capacity and semi-automatic operation that the bolt-action cannot match for close-quarters defensive use.
What does it weigh and what are the dimensions?
The Banshee Mk4 weighs 5.5 pounds (88 ounces) unloaded and measures 26.5 inches long with the brace collapsed, extending to 31.5 inches when fully deployed. The 10.5-inch cold hammer-forged barrel features a 1:7 twist rate optimized for stabilizing 62-grain and heavier projectiles, while the 9-inch M-LOK handguard provides ample real estate for accessory mounting without adding excessive weight forward of the receiver.
Who is this NOT for?
This platform is not suitable for beginners unfamiliar with NFA regulations, as the 10.5-inch barrel length makes this a Title II firearm requiring either pistol brace compliance or ATF Form 1 approval for shoulder stock configuration. Shooters seeking precision beyond 300 yards should consider a Stevens 334 in .243 Win with its 20-inch barrel and superior ballistic coefficient, while those requiring maximum concealability would be better served by a pistol-caliber carbine with shorter overall dimensions.
What's in the box?
The package includes one complete Banshee Mk4 pistol with installed RipBrace, one 30-round aluminum magazine, and the factory zeroed linear muzzle device threaded 1/2x28. Documentation includes warranty registration and ATF compliance notices regarding pistol brace regulations, but notably excludes any optical sighting system or additional magazines beyond the single provided unit.
Is the CMMG Banshee Mk4 worth it at $1550.99?
At $1550.99, the Banshee Mk4 justifies its premium through CMMG's radial delayed blowback system that reduces parts wear and recoil impulse compared to direct impingement AR pistols in the same price range. The included RipBrace represents a $150 value alone, while the Midnight Bronze Cerakote finish typically adds $200-300 to custom builds, making this configuration competitively priced against similar offerings from Daniel Defense or LWRC that often exceed $1800 without comparable recoil mitigation systems.
Key attributes
| upc | 810148624262 |
| manufacturer | CMMG |
| manufacturer part number | 55A420A-MB |
| action | Semi-Auto |
| barrel length | 10.5" |
| caliber/gauge | .223 REM/5.56 NATO |
| capacity | 30 |
| color | Midnight Bronze |
| length | 39.6000 |
| model | Banshee |
| number of magazines | 1 |
| product type | AR |
| safety | Ambidextrous |
| 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 |
Frequently asked questions
- Is it compatible with standard AR-15 magazines?
- Yes, the Banshee Mk4 accepts all Mil-Spec AR-15 pattern magazines including PMAGs, USGI aluminum, and Lancers. The included magazine is a 30-round CMMG-branded aluminum unit with anti-tilt follower.
- Does it fit in a standard rifle case?
- With the brace collapsed to 26.5 inches, it fits most 28-inch tactical cases but requires a minimum 8-inch interior width to accommodate the 2.25-inch wide handguard. Hard cases under 28 inches internal length will not accommodate this configuration.
- How long does shipping take to FFL?
- Ironclad Armory processes orders within 2 business days with shipping via FedEx 2Day to your selected FFL. Total transit time typically runs 3-5 business days from order placement to FFL notification.
- Can I return it if it doesn't function properly?
- Ironclad Armory accepts returns within 30 days for manufacturer defects only, requiring all original packaging and un-fired condition. Firearm returns must be initiated through our compliance team and shipped via approved carriers following ATF guidelines.
- Does this work with a SilencerCo Omega 300 suppressor?
- Yes, the 1/2x28 threaded muzzle accepts direct-thread suppressors or muzzle devices compatible with SilencerCo's ASR system. The carbine gas system may require adjustable gas block tuning for optimal suppressed operation with 5.56 ammunition.