.223 / 5.56x45mm NATO Ammunition

When talking about the world's most iconic firearms, the AK-47 will reign supreme in any legitimate discussion. Following closely behind, however, is likely to be the M16/AR-15. But this is a page dedicated to ammunition, so as much as I would like to, we are not going to sit around discussing firearms. I did bring up the M16 and the AR-15 for good reason, though. They are designed to fire the .223 Remington and 5.56x45mm NATO cartridges. Developed by Remington Arms in the early 1960s, the .223 Remington/5.56x45mm NATO cartridges were designed to fit the action of the M16 after the United States Armed Forces decided to replace both the M14 and the 7.62x51mm NATO cartridge. This was decided after the conclusion was reached that modern combat no longer required high-powered rifle cartridges or precise aiming.

Though the 5.56x45mm NATO cartridge was derived from the .223 Remington cartridge, they are not identical even though they share extremely similar external dimensions and specifications. That said, it is safe to fire .223 Remington ammunition in a rifle chambered in 5.56x45mm NATO, but you may want to rethink firing 5.56x45mm NATO ammunition in a rifle chambered for .223 Remington.

These cartridges are two of the most widely-used cartridges in the United States. They are popular with rifles like the AR-15 and the Ruger Mini-14. That said, these cartridges are relatively inexpensive and are popular with target shooters. In an effort to supply our customers with the widest selection and the best prices around, Keepshooting.com has decided to carry .223 Remington ammunition and 5.56x45mm NATO ammunition. If you have an AR-15, you may be interested in our .223 Remington ammunition. Each box contains 20 rounds brass-cased ammunition. Those looking for a cheaper alternative may enjoy the steel-cased Brown Bear .223 ammunition. For under $6, you will receive 20 rounds of 55gr FMJ bullets. Remember to check back for a greater variety in the near future!