The Maxim Defense MD:9 Series is built to bring cutting-edge performance and modern design to the AR-9 platform. Engineered for both military and commercial use, every MD:9 upper delivers superior handling, premium components, and dependable 9mm firepower. The entire lineup features free-floating barrels, custom M-RAX/M-SLOT compatible handguards, and monolithic-style upper profiles for improved accuracy, durability, and adaptability. Whether you're building a short barrel rifle for CQB, a brace-equipped pistol, or a suppressed carbine, the MD:9 series is designed for smooth operation, precision, and total control across any mission or environment.