The 5.56×45mm NATO (official NATO nomenclature 5.56 NATO, commonly pronounced "five-five-six") is a rimless bottlenecked centerfire intermediate cartridge family developed in the late 1970s in Belgium by FN Herstal. [5] . It consists of the SS109, L110, and SS111 cartridges.

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Incredibly fast, with a muzzle velocity that’s generally more than 3,000 feet per second, you’ll find 5.56 ammo with a 62-grain projectile as well as lighter rounds with a common 55-grain bullet. In either case, you can expect muzzle energy to be in the ballpark of 1,300 foot pounds.

The table below gives a list of firearms that can fire the 5.56×45mm NATO cartridge, first developed and used in the late 1970s for the M16 rifle, which to date, is the most widely produced weapon in this caliber. [1] . Not all countries that use weapons chambered in this caliber are in NATO. This table is sortable for every column.

The 5.56mm Nato is a mid-sized rimless bottlenecked cartridge named for its use as the second standard service rifle cartridge for NATO forces in the 1980s. It was originally intended for the M16 and is often used in the AR-15, though it can also be used in many rifles from several of the top manufacturers in the business.

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