The AR-15’s modular design is a big plus for riflemen, and the .300 Blackout cartridge is perhaps the best example of this advantage. However, the .300 Blackout is a popular option for many reasons. First, the conversion works and is reliable. The bugs are worked out, and the rifle will feed function and run with .300 BLK ammunition. Read the article to discover all the reasons you should be shooting the .300 BLK.