COLT MONOLITHIC CARBINE 5.56 NATO SEMI AUTO RIFLE The Colt Monolithic Carbine delivers a professional-grade AR platform engineered for precision, durability, and modular performance. Developed as an advanced evolution of the M4 platform, this rifle features Colt's patented monolithic upper receiver, creating a rigid, one-piece design that enhances accuracy and maintains consistent alignment for optics and accessories. Chambered in 5.56 NATO, this rifle is built around a direct impingement operating system that ensures reliable function and smooth cycling. The monolithic upper integrates a continuous Picatinny rail, allowing optics and accessories to maintain zero even after Mfg: Colt