It was developed in 1957 by Remington Arms and Fairchild Industries for the U.S. Continental Army Command of the United States Army as part of a project to create a small-caliber, high-velocity firearm.

223 Remington bolt, semi-auto and lever action rifles for small game, medium game, and predator hunting.

Take a look at our selection of .223 Remington and 5.56 NATO ammo from top manufacturers. We carry the best .223 Rem and 5.56mm ammo on the market.

Oct 23, 2025 · When it comes to the 223 vs 5.56, it’s not so much about which one is best, but about the differences between them. The 223 Remington and 5.56 NATO cartridges have identical case …

Apr 20, 2023 · He wasn’t wrong about one thing: the .223 Remington and the 5.56 NATO are identical on the outside. But there are important differences underneath the surface of both the cartridge and …

Jan 8, 2026 · Confused about .223 vs 5.56 vs .223 Wylde? This guide breaks down what’s safe to shoot, accuracy differences, and which chamber is best for your needs.

The history of .223 ammunition, also known as 223 Remington or 5.56 ammo, dates back to the mid-1960s. Developed by Remington Arms as a commercial cartridge for hunting and varmint shooting.

Learn the history and technical differences between .223 Remington and 5.56×45mm NATO, plus safety tips on interchangeability and .223 Wylde.

Explore .223 Remington rifles at Academy Sports + Outdoors.