The AR-15 platform is famous for its versatility, and few debates illustrate that better than the comparison between the .300 AAC Blackout and the 5.56 NATO. At first glance, the two cartridges seem remarkably similar. Both can be fired from the same AR-15 lower receiver, both use standard magazines, and both are popular among civilian … Continue reading .300 Blackout vs. 5.56 NATO in the AR-15: Choosing the Right Tool for the Job