Two common chamberings for AR-style rifles are 5.56 NATO and a less-common, more modern offshoot, .300 BLK, also referred to as .300 Blackout. Side by side, it is apparent that…
Two common chamberings for AR-style rifles are 5.56 NATO and a less-common, more modern offshoot, .300 BLK, also referred to as .300 Blackout. Side by side, it is apparent that…