Some of the most popular magazines for the AR are the 5.56 NATO/.223 Rem and the .300 Blackout. The classic is, of course, the 5.56 NATO/.223 Rem, based on the original designs going back to the 1950s and 60s. The 300 Blackout AR magazine is a modern adaptation, delivering more power at subsonic levels. We offer a wide inventory of all of these magazines from a number of different manufacturers. You can expect any AR 223 mag or 300 AAC Blackout AR magazine to work every time you take it out for target practice. We only stock the proven quality when it comes to 300 Blackout and 223 5.56 magazines. If you are in the market, get your AR 223 magazine ordered today.