To repeat "The Dancing Gun" bug you need a pistol. Haven't tried to do it with rifles though.
Basically if you are standing on the top of deerstand and try to throw away your pistol it's starts to "dance" in the middle of thin air. OK Mr.Ghost, I give up! Don't shot!
Have repeated this bug on several servers - privates and public.
Also uploaded the video. Here is the LINK - **THE DANCING GUN**