Originally posted on Reddit, one very fortunate shooter survived a catastrophic failure by detonating a 300 BLK in 5.56 firearm. 300 BLK has many advantages, but can have one real disadvantage. It can chamber in a 5.56 firearm under certain circumstances.
Quote from Reddit:
Murphy’s Law struck hard this past weekend where somehow some way a 300BLK round made it from the box on one side of the table, into the mag of another AR on the other table. No one was hurt due to proper PPE. The lower survived with just a broken bolt catch and the upper, as one would expect, is a complete loss.
Always make sure to know your caliber.