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.

为步枪与机枪而设计，又称5.56 NATO，使用于包括 M16自动步枪 与M249机枪在内的许多 美国 与北约系统的枪械。 M193 步枪弹 (比利时称之为SS92)是最早被选作军用的5.56x45mm步枪弹, 由民用.223 Remington提高 膛压 演变而来, 目的是为提高初速. 美军于越战时期开始使用，1970年成为北约（NATO） 会员国 的标准用弹。 5.56x45 NATO与民用.223 Remington 尺码 几乎完全相同，不过 5.56 NATO因为高膛压必须使用较厚的弹壳。 民用.223 Remington 枪械使用5.56 …

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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.

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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.

2025年2月5日 · Yes, there is a difference between 5.56 and 5.56 NATO ammunition, albeit subtle yet significant, primarily in pressure and chamber specifications, potentially leading to safety concerns depending on the firearm used.