Yeah the rails are for more added stability that's a rig for hand held shots, redrock micro who makes that rig also has shoulder support ones but their stuff is $$$$ zacuto, cavision, redrock micro, just to name a few manufacturers.. definitely a good investment if youre shooting music videos. I plan to get a lot of shit this year, already have a jib, next up is some lighting, lenses, and a dolly w/ tracks.. i'll never be happy unless I get "the shot"