T'was a very informative and helpful tutorial. It was also funnily written and you included a lot of things many people wouldn't think about such as gun jams, recoil and animation organization.
My only complaint is that you seemed to have cut the drawing part short somewhat by just saying "Practice". There are quite a few smaller things and tricks there are such as the various ways of shading, using textures for complicated patterns (such as the grip of many handguns), etc.
Overall though, this was a very nice tutorial, and the artwork was pretty good.