Winchester USA 5.56x45mm NATO 55 Grain Full Metal Jacket Overview The Winchester USA 5.56x45mm NATO is a high-performance, military-grade round designed for reliability and accuracy. Featuring a 55-grain Full Metal Jacket (FMJ) bullet, this ammunition is ideal for target shooting, training, and tactical applications. With a muzzle velocity of 3,270 fps, it provides flat trajectories and consistent performance, making it a top choice for AR-15 and other 5.56 NATO firearms. Specifications MPN: SGM193KW UPC: 020892225626 Brand: Winchester Ammo Category: Centerfire Rifle Rounds Model: USA Caliber: 5.56x45mm NATO Rounds Per Box: 20 Boxes Per Case: 50 Casing Material: Brass Bullet Type: Full Metal Jacket (FMJ) Bullet Weight: 55 gr Muzzle Velocity: 3,270 fps Muzzle Energy: 1,306 ft-lbs Key Features Military-Spec Performance - Reliable and consistent Brass Casing - Smooth extraction and reloadability Non-Corrosive Primers - Cleaner shooting with less fouling Ideal for AR-15 & 5.56 NATO Firearms - Compatible with standard 5.56 NATO chambers Applications Target Shooting & Training - Cost-effective for regular practice Tactical & Law Enforcement Drills - Reliable mil-spec ammo High-Volume Shooting - Perfect for range days