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5.56x45 is the ammunition originally developed for the M16 rifle. Many people mistakenly claim it is the same as .223 Remington ammunition, although this is not true - while the dimensions are similar, neck angles and other measurements differ between the two cartridges.

In the late 1970s, after the US had announced that troops stationed in Europe would be equipped with M16 rifles, NATO sought a cartridge to make standard amongst their forces, in order for there to be cross compatability between NATO military forces. The weight of the 5.56x45 projectile was increased from 55 to 62 grains.

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Q: What is a 5.56 x 45 NATO ammunition?
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