AmmoDyn 5.56x45mm NATO 55 grain Full Metal Jacket Brass Cased Rifle Ammo 30 Rounds. 5645mm service ammunition. A mission-minded choice for patrol-rifle training carbine courses and high-volume drillsengineered for predictable performance and consistent cycling when the tempo increases. Specifications for AmmoDyn 5.56x45mm NATO 55 grain Full Metal Jacket Brass Cased Rifle Ammunition: Manufacturer: AmmoDyn Caliber: 5.56x45mm NATO Number of Rounds: 30 Bullet Type: Full Metal Jacket (FMJ) Bullet Weight: 55 grain Cartridge Case Material: Brass Features of AmmoDyn 5.56x45mm NATO 55 grain Full Metal Jacket Brass Cased Rifle Ammunition NATO-spec M193 Sealed primers Waterproofed Extreme-temperature tested Carbine training load Non-corrosive Package Contents: AmmoDyn 5.56x45mm NATO 55 grain Full Metal Jacket Brass Cased Rifle Ammunition AmmoDyn PM-55655-30: 5.56x45mm NATO 55 grain Full Metal Jacket Brass Cased Rifle Ammo 30 Rounds