Description The CMMG Banshee MK4 .338 ARC 10.5″ Arm Black is a cutting-edge AR-platform pistol designed for shooters who demand performance, modularity, and innovation in a compact package. This firearm represents the latest evolution of CMMG’s acclaimed Banshee line, engineered specifically for the .338 ARC cartridge—a modern intermediate round that delivers superior ballistics in a direct impingement system. The 10.5-inch barrel provides an excellent balance of velocity, handling, and portability, making the Banshee MK4 ideal for close-quarters applications, home defense, and tactical training. With its Arm Black finish and reputation for precision manufacturing, this platform stands as one of the most versatile AR pistols available today. Table of Contents Toggle CMMG Banshee MK4 .338 ARC 10.5″ — Key SpecificationsPerformance & ReliabilityIntended Use & ApplicationsWhy Buy From CaliperDepot? CMMG Banshee MK4 .338 ARC 10.5″ — Key Specifications Caliber: .338 ARC (Advanced Rifle Cartridge) Action: Semi-automatic direct impingement gas system Barrel Length: 10.5 inches, chrome-lined and finished Overall Length: Approximately 17.5 inches with buffer tube Finish: Arm Black hard anodized aluminum and steel Magazine Capacity: Accepts standard AR-15 magazines (typically 10 rounds) Upper Receiver: Assembled with integrated rail system Lower Receiver: Forged 7075-T6 aluminum with standard AR controls Grip: Standard AR pistol grip with safety selector Sights: Picatinny rail system for optics and iron sight mounting Weight: Approximately 5.5 pounds unloaded Handguard: Free-floating modular system for rails and accessories Performance & Reliability The CMMG Banshee MK4 .338 ARC delivers exceptional accuracy and reliability through its proven direct impingement system and precision-manufactured components. The .338 ARC cartridge offers significantly improved ballistics over common intermediate cartridges, providing flatter trajectories, superior energy retention, and enhanced penetration characteristics. When paired with quality ammunition, the Banshee MK4 demonstrates sub-MOA capability at distance while maintaining reliability in rapid-fire scenarios, making it an excellent choice for both precision marksmanship and dynamic shooting applications. CMMG’s reputation for quality manufacturing is evident throughout the Banshee MK4 .338 ARC 10.5″ platform. The chrome-lined barrel ensures extended service life and easy maintenance, while the precision-fit components minimize tolerance stacking and enhance overall reliability. Shooters report consistent performance across various ammunition types, and the modular design allows for straightforward maintenance and parts replacement without specialized tools. The 10.5-inch barrel provides optimal velocity for .338 ARC ammunition while maintaining the compact handling characteristics essential for tactical applications. The Banshee MK4’s gas system is tuned specifically for this configuration, ensuring reliable cycling with a wide range of ammunition loads. The Arm Black finish provides both aesthetic appeal and practical corrosion resistance, protecting your investment for years of regular use. Intended Use & Applications The CMMG Banshee MK4 .338 ARC 10.5″ Arm Black is purpose-built for modern tactical shooters, self-defense professionals, and shooting enthusiasts who prioritize modularity and performance. Many choose this platform for home defense, where the compact size facilitates movement through confined spaces while the .338 ARC delivers superior stopping power compared to traditional pistol calibers. Law enforcement trainers and private security contractors increasingly adopt the Banshee MK4 for its balanced blend of velocity, handling, and magazine compatibility with established supply chains. Competitive shooters benefit tremendously from the Banshee MK4’s precision potential and customization options. The free-floating handguard and Picatinny rail system allow seamless integration of optics, lasers, and tactical accessories tailored to specific competition formats. Whether competing in 3-Gun, PRS pistol divisions, or specialized tactical courses, the CMMG Banshee MK4 provides a reliable platform capable of winning matches. For more information on the .338 ARC cartridge specifications and ballistics data, visit the .338 ARC Wikipedia article. Recreational shooters and hunting enthusiasts find the Banshee MK4 excellent for varmint control, predator management, and small-to-medium game hunting in jurisdictions permitting AR pistols. The increased ballistic performance of the .338 ARC over traditional intermediate cartridges makes the CMMG Banshee MK4 suitable for extended-range hunting applications. The modular platform also appeals to builders who want to customize trigger assemblies, stocks, or other components to suit their specific preferences—making the Banshee MK4 an investment in a platform that grows with your needs. Why Buy From CaliperDepot? CaliperDepot specializes in providing shooters with access to the latest firearms and ammunition from trusted manufacturers like CMMG. We maintain competitive pricing on premium products like the Banshee MK4 .338 ARC 10.5″ while offering the reliable customer service and technical expertise you deserve. Our inventory team stays current with new releases and hard-to-find configurations, ensuring you can find exactly what you’re looking for without unnecessary delays or substitutions. When you order from CaliperDepot, you benefit from fast, discreet shipping directly to your door (where legal) and a straightforward returns policy if you’re not completely satisfied. We understand that selecting the right firearm is a significant decision, and our knowledgeable staff is available to answer technical questions about the Banshee MK4 or recommend complementary accessories. Browse our complete selection of AR rifles and pistols to discover other high-performance options, or explore our ammunition section for quality .338 ARC loads. Don’t miss the opportunity to own the CMMG Banshee MK4 .338 ARC 10.5″ Arm Black—one of the most innovative and reliable AR pistols on the market today. With its exceptional ergonomics, proven track record, and cutting-edge caliber, the Banshee MK4 is ready to serve you in whatever application you choose. Add it to your cart now and experience the difference that precision manufacturing and thoughtful design make in real-world performance. Order your Banshee MK4 from CaliperDepot today and join thousands of satisfied shooters who trust CMMG’s quality and innovation.