.223 Rem vs 5.56 NATO: What’s the Difference and Which Should You Choose?

If you’ve shopped for AR-15 ammunition, you’ve almost certainly noticed two cartridges that appear nearly identical: .223 Remington and 5.56 NATO. At first glance, they look the same. Their external dimensions are extremely similar, many rifles appear capable of firing either cartridge, and countless online discussions suggest they’re interchangeable. The reality is more nuanced. Although […]