The SPIKE'S 556 UPPER 14.5"PB RAIL/DYN from Spikes Tactical delivers a complete AR-style upper receiver ready for builder and shooter alike, engineered around a 5.56x45mm NATO chamber with a 14.5-inch pinned barrel delivering a 16-inch overall length and a rugged 1:7 twist for versatile projectile compatibility. This Black flat-top upper features a mid-length gas system that smooths recoil and enhances reliability, paired with a durable Dynacomp muzzle brake to help manage muzzle rise during rapid fire. A full 12-inch CRR quad rail provides ample real estate for accessories while keeping weight balanced for field use, without sights installed to allow immediate customization with your preferred optics and backup irons. Built to fit AR rifles, this complete upper receiver maintains a clean, professional profile with a robust upper receiver surface designed for durability under demanding conditions, making it suitable for tactical training, varmint hunting, or range-day precision. With its precision 1:7 barrel rate and black finish, this upper is an excellent foundation for a high-performance rifle build that blends reliability, modularity, and streamlined installation.