Backed by generations of legendary excellence, Winchester “USA White Box” stands for consistent performance and outstanding value, offering high-quality ammunition to suit a wide range of hunter’s and shooter’s needs. This Winchester Manufactured 5.56x45mm NATO is new factory-loaded at the Lake City Army Ammunition Plant, made with a 55 Grain M193 Full Metal Jacket Boat Tail Projectile & Brass Case. Designed for range training and tactical exercises. Developed in the United States and originally chambered in the M16 rifle, the 5.56 cartridge is commonly used in AR-15s, making it one of the most popular rounds in the American shooters market, offering fast velocity and low recoil. 150rd sealed bulk packaging.