Freedom Munitions 5.56x45mm NATO 55 Grain Full Metal Jacket Brass Rifle Ammo 500 Rounds. 56 M193-style rounds feature a 55-grain full metal jacket (FMJ) projectile perfect for consistent accuracy during range sessions Expect accuracy and consistency while sending Freedom down range at 3250 fps. Specifications for Freedom Munitions 5.56x45mm NATO 55 Grain Full Metal Jacket Brass Rifle Ammunition: Manufacturer: Freedom Munitions Caliber: 5.56x45mm NATO Bullet Type: Full Metal Jacket (FMJ) Bullet Weight: 55 grain Cartridge Case Material: Brass Application: General Package Contents: Freedom Munitions 5.56x45mm NATO 55 Grain Full Metal Jacket Brass Rifle Ammunition What is Freedom Munitions 5.56x45mm NATO 55 Grain Full Metal Jacket Brass Rifle Ammunition good for? The manufacturer says that it is best for general.Freedom Munitions FM556MF55N500: 5.56x45mm NATO 55 Grain Full Metal Jacket Brass Rifle Ammo 500 Rounds