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.

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]

If it is newer than M855 (the mid-1980s) and it is military, you can be sure it is 5.56 and should be treated accordingly. A .223 Remington and 5.56×45 are not the same. The 5.56 has a longer …

Mar 4, 2013 · The main differences are that 5.56x45 mm NATO operates at a higher chamber pressure (about 60,000 p.s.i. versus 55,000 p.s.i. on the .223 Rem.) and the 5.56’s chamber is slightly larger...

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The 5.56×45mm NATO round, pronounced " five-five-six ", is an intermediate cartridge and the main bullet type used by guns made for NATO militaries. It was first used in the Vietnam War as the main bullet used by the US military.

The 5.56x45mm NATO round is an improved version of the M193 round that was developed in Belgium. Compared to the older M193 the SS109 uses a heavier and more effective bullet, uses a cleaner propellant, has a lower muzzle velocity and uses a faster rifling twist rate.

The 5.56×45mm NATO (official NATO nomenclature 5.56 NATO) is a rifle 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. [3]

Apr 24, 2022 · The differences between 5.56 Nato and 5.56 × 45mm center around bottleneck size and case profile. The NATO rounds use a .223 bottleneck, while the x 45mm uses a .223 L-shape bottleneck.

Sep 26, 2024 · The 5.5645mm 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 nonNATO countries.