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 …

223 vs 556: What’s the Difference? The cartridge cases of the 223 Rem and 5.56 NATO appear identical on the outside, but 556 cases can have minutely thicker case walls.

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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 …

Ruger AR-556 10 Round 5.56x45 AR-15 Rifle With M-LOK Handguard, Black - 8537 Out of Stock Notify When In Stock

America’s favorite cartridge, the 5.56 offers a wide range of loadings, proven performance, and a host of capable Springfield Armory firearms to fire them. Whether you want a rifle or a pistol, …

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Feb 5, 2025 · 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 …