Global Ordnance 5.56x45mm NATO 55 grain Full Metal Jacket 20 Rounds Rifle Ammo GO. They have spent years building relationships with global manufacturers and distributors of ammunition" firearms and equipment for military and law enforcement contracts. Specifications for Global Ordnance 5.56x45mm NATO 55 grain Full Metal Jacket Rifle Ammunition: Manufacturer: Global Ordnance Caliber: 5.56x45mm NATO Number of Rounds: 20 Bullet Type: Full Metal Jacket (FMJ) Bullet Weight: 55 grain Package Contents: Global Ordnance 5.56x45mm NATO 55 grain Full Metal Jacket Rifle Ammunition