The Alexander Arms UST17 Upper Parts Kits delivers a purpose-built AR-15 platform upgrade in 17 Hornady Magnum Rimfire with an 18" barrel, featuring a Black Cerakote aluminum receiver and Black M-LOK handguard for lasting durability and stealthy aesthetics. This upper assembly is designed for optic-ready performance, pairing an 18" barrel with a 1:9 twist to optimize stability and accuracy for 17 HMR loads, while the Black barrel and handguard finishes provide a cohesive, low-reflective profile. Crafted to enhance precision shooting and varmint control, the UST17 upper integrates seamless compatibility with standard AR-15 components, ensuring straightforward installation and reliable cycling. The kit includes two magazines, supporting rapid reloads during extended range sessions or field use, and its upper receiver architecture supports versatile mounting options for modern optics and accessories. Ideal for hunters, target shooters, and enthusiasts seeking a dedicated 17 HMR upper, this Alexander Arms assembly combines rugged construction with practical features to maximize performance on the firing line or in the field. With optic-ready readiness and robust M-LOK versatility, it represents a streamlined path to elevating your AR-15 platform in 17 HMR applications.