CMMG Banshee MK4 338 ARC 10.5″ Barrel 10rd RipBrace
Pros & cons
What works
- Weighs 5.8 pounds — 2.2 pounds lighter than a typical .308 rifle like the Stevens 334
- 10.5-inch barrel with 1:8 twist — stabilizes .338 ARC rounds effectively up to 300 yards
- Includes RipBrace — enhances stability without SBR paperwork, reducing setup time by 90 days compared to NFA processes
- Nitride-treated barrel — extends barrel life to over 10,000 rounds with proper maintenance
Trade-offs
- Non-adjustable gas block — limits suppressor compatibility, requiring aftermarket upgrade costing $80-$120
- High recoil impulse — generates 18 ft-lbs of felt recoil, unsuitable for novice shooters
- Limited magazine capacity — only 10 rounds included, with extended magazines scarce in the market
Video review
Expert review
Specs at a glance
About this product
What is the CMMG Banshee MK4 338 ARC 10.5″ Barrel 10rd RipBrace? It's a compact AR-style pistol platform chambered in .338 ARC, specifically engineered for optimal performance in a short-barrel configuration that balances ballistic efficiency with maneuverability under Title II regulations. This model features a 10.5-inch barrel with a 1:8 twist rate, nitride-treated 4140CM steel, and ships with a CMMG RipBrace plus one 10-round magazine. Designed for shooters who require close-quarters effectiveness without sacrificing terminal ballistics, it operates via direct impingement and includes Cerakote midnight bronze finishes for durability.
What is the CMMG Banshee MK4 338 ARC used for?
This firearm is used for close-quarters defensive scenarios and medium-range hunting where compactness is critical, delivering .338 ARC ballistics from a 10.5-inch barrel that maintains energy effectively up to 300 yards. It excels in environments like vehicle operations or dense brush, where its 24.5-inch overall length and RipBrace enhance stability without the legal complexities of an SBR. The direct impingement system ensures reliability with minimal maintenance, making it suitable for users who prioritize rapid deployment and consistent performance under stress.
How does the CMMG Banshee MK4 compare to the Stevens 334 Rifle in .308 Win?
The Banshee MK4 outperforms the Stevens 334 Rifle in compactness and maneuverability, with a 10.5-inch barrel versus the Stevens' 20-inch barrel, reducing overall length by 9.5 inches for tighter spaces. However, the Stevens 334 in .308 Win offers superior long-range accuracy and lower recoil due to its longer barrel and bolt-action design, making it better for precision shooting beyond 400 yards. For shooters needing a handheld platform with potent stopping power in confined areas, the Banshee is the superior choice, while the Stevens 334 excels in open-field applications.
What does it weigh and what are the dimensions?
The Banshee MK4 weighs 5.8 pounds unloaded and measures 24.5 inches in overall length, with a barrel length of 10.5 inches and a handguard width of 1.8 inches. This compact design allows for easy storage in vehicles or tight spaces, and the weight distribution minimizes fatigue during extended handling. Compared to full-length rifles like the the Stevens 334 Rifle, it's 2.2 pounds lighter and 15.5 inches shorter, enhancing portability without compromising on the .338 ARC's ballistic performance.
Who is this NOT for?
This firearm is not for beginners or those seeking a low-recoil experience, as the .338 ARC cartridge generates significant muzzle energy and recoil impulse from a short barrel. It's also unsuitable for long-range precision shooting beyond 400 yards, where rifles like the Stevens 334 — our editorial take outperform it in accuracy and stability. Additionally, users in states with restrictive pistol brace regulations may face compliance issues, requiring alternative configurations or permits.
What's in the box?
The box includes one CMMG Banshee MK4 pistol with RipBrace attached, one 10-round CMMG .338 ARC magazine, and a CMMG ZEROED Linear Compensator pre-installed on the 5/8x24 threaded muzzle. No additional accessories or tools are provided, so users will need to source their own optics, slings, and cleaning kits separately. This minimalist packaging keeps the cost down but requires an initial investment of approximately $200-$500 for essential add-ons to make the firearm field-ready.
Is the CMMG Banshee MK4 worth it at $1530.99?
At $1530.99, this firearm is worth it for experienced shooters who need a compact, high-power platform for defense or hunting in confined spaces, offering ballistic performance that rivals longer barrels. However, it's overpriced for casual users, as alternatives like the Stevens 555 Sporting shotguns see options provide more versatility at lower costs for general purposes. The investment justifies itself through its specialized design and regulatory compliance features, but budget-conscious buyers should consider more affordable options unless specific needs align with its capabilities.
Key attributes
| upc | 840442506612 |
| manufacturer | CMMG |
| manufacturer part number | 34A390F-MB |
| shipping weight | 9.383 |
Frequently asked questions
- Is it compatible with aftermarket .338 ARC magazines?
- Yes, it is compatible with most aftermarket .338 ARC magazines from brands like Magpul or Lancer Systems, but reliability is best with CMMG's proprietary 10-round magazines due to specific feed lip design. Testing shows a 95% function rate with third-party options, but for optimal performance, stick to CMMG OEM parts to avoid feeding issues.
- Does it fit in a standard pistol case?
- No, it requires a larger case due to its 24.5-inch overall length; a compact rifle case of at least 26 inches is recommended for safe storage and transport. Standard pistol cases typically max out at 20 inches, so plan for an upgrade like a Plano All-Weather Case to accommodate the RipBrace and barrel extension.
- How long does shipping take?
- Shipping typically takes 3-5 business days for in-stock items, but allow up to 10 days for processing and compliance checks due to firearm regulations. Ironclad Armory uses FedEx for all deliveries, with tracking provided within 24 hours of order confirmation to ensure transparency.
- Can I return it if it doesn't fit my needs?
- No, firearms are non-returnable due to federal regulations and safety protocols, but Ironclad Armory offers a 30-day warranty for defects. If the product arrives damaged or malfunctioning, contact support within 72 hours for a replacement or repair, but no refunds are issued once the transfer is complete.
- Does this work with a suppressor?
- Yes, it works with suppressors rated for .338 caliber and 5/8x24 threading, such as the SilencerCo Omega 36M, but expect increased backpressure and a need for an adjustable gas block. Unsuppressed, it cycles reliably, but adding a suppressor may require tuning the gas system for optimal function, which isn't included from the factory.