PMC X-Tac 5.56mm NATO 62gr LAP Centerfire Rifle Ammo - 20 Rounds - PMC X-TAC line of ammunition products is tried and tested by military and law enforcement around the world. When a serious threat arises and your life is on the line, that fraction of a second is the precise moment you can't think about your ammunition. Muzzle Velocity: 3100 FPS (from a 20in Barrel); 2920 FPS (from a 16in Barrel) Muzzle Energy: 1323 FT/LBS Bullet Ballistic Coefficient: .243 Casing: Reloadable Brass Primer: Non-Corrosive Boxer