To be fair, he is comparing a shotgun (that was at best a "state of the art" weapon in the early 1800's) to a modern semi-auto rifle designed for ease of use in its most refined iteration. A comparison against a modern quality semi-auto shotgun would have been alot more relevant.
I enjoy Hickok45's video's but this one seemed to try a bit too hard to reinforce the fact that the AR is a great weapon by painting the shotgun in the worst possible light.