PMC 556(M55)BP Battle Pack 5.56X45mm Nato 62 Gr Light Armor Piercing (Lap) 120 Bx/ 5 Cs PMC Battle Packs Are Built To Take a Beating To Keep Your PMC Ammunition Safe And Secure. PMC Battle Packs Are Vacuum-Sealed And Wrapped In a High Density advanced Polymer Sleeve. Caliber: 5.56X45mm Nato Bullet Type: Light Armor Piercing (Lap) Bullet Weight: 62 Gr Muzzle Energy: 1323 ft Lbs Muzzle Velocity: 3100 Fps Rounds Per Box: 120 Boxes Per Case: 5 Application: Plinking Casing Material: Brass