MCree’s gun will appear small and then after a few seconds will grow larger. also, in the past, whatever skin the hero was equipped with was shown on the main menu screen. so, if 76 was shown and you switched skins, the skin would change in the main menu. now it appears, this is no longer the case.
edit since i cant reply until someone else does :
apparently, this glitch is just something to do with the Mystery man skin. i changed his skin to the Royal skin and the gun doesnt appear to change sizes after a few seconds …