Most avid fans of the AR-15 are aware that it is safe to fire .223 Remington cartridges in an AR-15 chambered for 5.56 NATO but, it is not safe to fire 5.56 NATO cartridges in a rifle chambered for .223 Remington. Consequently, the very large majority of AR-15’s manufactured for the civilian market today are … Continue reading 5.56 NATO vs. .223 Wylde: What’s the difference?