Grain Weight: 62 Grains
Muzzle Velocity: 3,190 Feet per Second
Muzzle Energy: 1,235 Foot Pounds
Case Type: Brass
Quantity: 1,000 rds per case
The 5.56×45mm NATO (official NATO nomenclature 5.56 NATO) is an intermediate cartridge developed in the United States and originally chambered in the M16 rifle. Under STANAG 4172, it is a standard cartridge for NATO forces as well as many non-NATO countries. It is derived from but is not identical to, the .223 Remington cartridge.