Are all Picatinny rails basically the same? My Dad just bought a Zeiss Diavari that came with a set of Zeiss rings that are for a Picatinny rail mount. Well the rail it comes with, he claims the ring bases can move back and forth in the rail. It actaully isnt the right rail for his gun anyways, he was just messing with it. So he wanted me to ask if any brand of rail is fine, or does he need the Zeiss rail? It is going an a Weatherby Mark V Dlx. I havent ever had a rifle with a rail so i know very little about them myself. I thought they were universal in size so it really didnt matter but i could imagine tolerances are better on some than others?