Barnes Bullets Defense 12Ga 2-3/4in 21 Pellet #4 Buckshot Shotshells - 5 Rounds - Equip your self-defense firearm with the Barnes Defense 12-Gauge 21 Pellet 4 Buckshot Shotshells - 5 Rounds. These 12 gauge shotshells boast a 21-ounce shot and deliver 1200-feet per second (FPS) velocity. This 4 Buckshot ammo is constructed with a 2-3/4-inch shell length. Comes with 5 rounds per box.