If you guys don't follow In Range take the time and watch some of their videos. Generally good stuff like shooting 2 gun matches with one using a Garand and a 1911, the other a K98k and a P-38.
They kept getting asked to do mud tests and gave in doing a few. They did a AK-47 and it kinda failed. The AK fan boys lost their ever love'n minds! They did a AR and it had no problems like this one. The AK fan boys lost their ever love'n minds again. They explained how the AK with lots of openings wouldn't do well and the AR with very little ways to let mud is just a different design, not better. The AK fan boys lost their minds again and accused them of all sorts of things. Pretty funny.
The guy with the goatee is Ian McCollum. He has a web site/video channel on his own, Forgotten Weapons. Great if your interested in the history of firearms.