<p>Hornady&reg; BLACK&trade; 5.56x45mm NATO 62 Grain Centerfire Rifle Ammo is optimized for excellent performance in modern sporting rifle-type semi-auto rifles. Hornady BLACK ammunition feeds and functions in a variety of platforms, including direct impingement, gas piston, suppressed, unsuppressed, inertia, bolt, pump, supersonic, subsonic, rifle, carbine, or pistol. Superefficient propellants, designed for use in short barrels, result in a 15% to 20% temperature reduction, delivering a progressive burn rate that burns clean with minimal flash. Hornady BLACK Rifle Ammo is offered in a variety of bullet options to match your rifling twist, and your intended target. Loaded with Hornady brass casings.&nbsp;</p> <ul> <li>Optimized for modern sporting rifle-style semi-auto rifles</li> <li>Functions with a variety of platforms</li> <li>Superefficient propellants</li> <li>Burns clean with minimal flash</li> <li>Offered in a variety of bullet options</li> <li>Hornady brass casings</li> </ul>