This M855 5.56 Penetrator ammo from Winchester comes in a value pack of 150 rounds. The green-tip M855 round is currently in use by the U.S. Military, and has much-improved penetration characteristics over the old M193 5.56 55-grain projectile at all ranges, resulting in higher retained velocity and greater accuracy at long range.Specifications: Caliber: 5.56mm NATO Bullet Weight: 62 Grain Bullet Style: Full Metal Jacket Muzzle Velocity: 3100 fps Muzzle Energy: 1323 ft/lbs Casing: Brass Quantity: 150 Rounds per box (Value Pack)