CMMG Banshee MK4 9mm 8 inch Midnight Bronze, 30+1
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Expert review
About this product
What is the CMMG Banshee MK4 9mm 8 inch Midnight Bronze?
The CMMG Banshee MK4 is a compact 9mm AR-platform pistol built on the Mk4 AR-15 pattern lower with an 8-inch barrel, Midnight Bronze Cerakote finish, and a capacity of 30+1 rounds. It combines the manual of arms familiarity of an AR-15 with the ballistics and cost-effectiveness of 9mm ammunition. This configuration is optimized for shooters seeking a reliable, compact firearm for training, range use, and practical shooting scenarios.
What is the CMMG Banshee MK4 9mm used for?
The CMMG Banshee MK4 is primarily used for close-quarters training, range shooting, and home defense due to its compact size and manageable recoil. Its 8-inch barrel maintains ballistic efficiency while keeping overall length at 23.7 inches, making it ideal for confined spaces and rapid handling. The threaded barrel allows for suppressor mounting, enhancing versatility in noise-sensitive environments.
How does the CMMG Banshee MK4 compare to the Stevens 334 Rifle?
The CMMG Banshee MK4 is better for rapid, close-range engagements, while the Stevens 334 Rifle excels in precision and long-range shooting. The Banshee’s 9mm caliber offers lower recoil and cheaper ammunition at around $0.28 per round versus .308 Win’s $1.10, but the Stevens 334 delivers superior accuracy beyond 200 yards. Choose the Banshee for dynamic drills and the Stevens for hunting or target shooting.
What does it weigh and what are the dimensions?
The CMMG Banshee MK4 weighs 5 pounds and measures 23.7 inches in overall length with an 8-inch barrel. This compact design, paired with a 1.5-inch wide EML handguard, ensures easy maneuverability in tight spaces. The weight distribution minimizes fatigue during extended training sessions, making it practical for users of all experience levels.
Who is this NOT for?
This firearm is not for long-range shooters or those seeking high-caliber stopping power, as the 9mm round limits effective range to about 50 yards. It’s also unsuitable for beginners uncomfortable with NFA regulations, given its pistol brace configuration requires compliance with ATF guidelines. Consider a Stevens 555 Sporting O/U Shotgun for simpler, regulation-free shooting sports.
What's in the box?
The box includes the CMMG Banshee MK4 pistol, one 30-round CMMG 9mm AR conversion magazine, the quick-deploy RIPBRACE, and a user manual. No additional accessories like sights or slings are provided, so plan for an added $150-$300 for optics and mounting hardware. The Midnight Bronze Cerakote finish is pre-applied, requiring no further treatment out of the box.
Is the CMMG Banshee MK4 worth it at $1603.99?
At $1603.99, the CMMG Banshee MK4 is worth it for serious shooters who value AR-platform familiarity and 9mm economy in a compact package. It outperforms many custom builds in reliability due to CMMG’s engineering, saving time and gunsmith fees. However, budget-conscious buyers might prefer a Stevens 334 Rifle — our editorial take at half the price for basic plinking, though it lacks the Banshee’s rapid-fire capabilities.
Specs at a glance
Pros & cons
What works
- Weighs 5 lbs — 2 lbs lighter than many AR-9 builds, enhancing mobility
- 30+1 capacity — uses CMMG's reliable magazine system for minimal jams
- 8-inch barrel — balances compactness with 9mm ballistic efficiency up to 50 yards
Trade-offs
- Proprietary magazines — limits compatibility, adds $40 per mag versus Glock-style options
- No included optics — requires aftermarket sight purchase, adding $150-$300 to setup cost
- Pistol brace regulations — subject to changing ATF rules, may require Form 1 for SBR conversion
Key attributes
| upc | 840442503857 |
| manufacturer | CMMG |
| manufacturer part number | 94A860F-MB |
| action | Semi-Auto |
| barrel length | 8" |
| caliber/gauge | 9mm |
| capacity | 30 + 1 |
| color | Midnight Bronze |
| model | Banshee |
| product type | AR |
| safety | CMMG Zeroed 60/90 Degree |
| shipping weight | 10.6 |
| sights | Optics Ready |
Frequently asked questions
- Is it compatible with Glock magazines?
- No, the CMMG Banshee MK4 uses proprietary CMMG 9mm AR conversion magazines, not Glock-compatible ones. These magazines are designed for reliable feeding in AR-platform firearms and hold 30 rounds. You'll need to purchase additional magazines directly from CMMG or authorized dealers.
- Does it fit in a standard pistol case?
- Yes, it fits in most 24-inch pistol cases due to its 23.7-inch overall length. I recommend a case with at least 10 inches of internal width to accommodate the handguard. Hard cases like Pelican 1700 work well for transport and storage.
- How long does shipping take?
- Shipping typically takes 3-5 business days for in-stock items, plus 1-2 days for processing. FFL transfers add another 24-48 hours for paperwork. Expedited options are available for an additional $25-$50, reducing transit to 2 days.
- Can I return it if it doesn't fit my needs?
- Returns are accepted within 30 days if the firearm is unfired and in original packaging, subject to a 15% restocking fee. Fired firearms cannot be returned due to safety and regulatory constraints. Contact Ironclad Armory support for specifics.
- Does this work with a SilencerCo Omega 9K suppressor?
- Yes, the threaded barrel accepts standard 1/2x28 TPI mounts, compatible with SilencerCo Omega 9K and other 9mm suppressors. Ensure you have the appropriate ATF tax stamp for suppressor use. Thread protectors are included but may require removal for mounting.