The Patriot Ordnance Factory Minuteman Upper 13.75 5.56 Br integrates POF-USAs Mil-SPEC Enhanced bolt carrier and our patented Roller cam pin for smooth operation and reliable cycling, delivering a purpose-built AR-15 upper receiver assembly that meets the demands of serious shooters. Built around a 13.75 Nitride Mid-length barrel, this upper pairs a pinned Dead Air Keymo muzzle brake with a low profile gas block to optimize recoil management and accuracy, while the 13 Renegade rail provides robust M-LOK compatibility for versatile accessory mounting. Designed for rugged field use and precision shooting, the Minuteman Upper combines durability, streamlined compatibility, and thoughtful engineering to enhance reliability in a variety of environments. Whether youre building a patrol rifle, a competition setup, or a rugged weekend hunter setup, this upper offers a clean, integrated platform where the Mil-SPEC Enhanced BCG and Roller cam pin contribute to consistent Chamber-to-Extractor timing and dependable cycling with 5.56 rounds. Its a high-performance upgrade that emphasizes modularity, repeatability, and ease of customization for shooters who demand top-tier components and practical, real-world results.