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 …

Oct 30, 2025 · 556 ammo, officially known as 5.56x45mm NATO, is a rifle cartridge developed in the late 20th century for military and civilian use. It is the standard round for the AR-15 and …

5.56mm cartridges are ideal for target shooting, home defense, and varmint hunting. Their lightweight design allows for quick follow-up shots and mild recoil, making them accessible for …

5.56 AR15 rifles for sale online or in-store at Sportsman's Warehouse. Shop a full selection of 5.56 caliber AR15 rifles from top firearms manufacturers.

Oct 23, 2025 · 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.

Shop 556 ammo from top brands like Federal Ammunition, Hornady, Magtech, & more. Top customer service, fast shipping & best prices at Primary Arms.

Whether you're in search of an AR-style rifle, Garand style, or a bolt action rifle, you're in luck. MidwayUSA has a huge offering of 5.56 Rifles to meet your shooting needs. Check out rifles …

Affordable, American-made Modern Sporting Rifle with the rugged reliability that you have come to expect from Ruger.

Freedom Munitions manufactures affordable reloaded and new 5.56 ammunition suitable for the range, hunting, competition, or self-defense.

Dec 7, 2024 · Get the facts on 5.56 NATO, from its origin and history to its measurements, ballistics, and comparisons to other calibers. The 5.56x45mm ammunition is one of the most …