It feels kind of like the bolt hasnt cocked whenever it doesnt fire. Could the oil and unburnt powder be causing that? I have never taken one apart but I will follow the directions that came with the gun and watch that video as well and see if i can solve the problem with a good cleaning. I was able to take my Colt Woodsman apart and back together pretty easily and people say those are a pain so maybe I can get the hang of the MK III as well. Thanks for the advice.