Picatinny and Weaver will accept the same rings which are usually referred to as weaver style. The picatinny is usually used to describe a mount used by the military that has all the slots at the exact same distances so that you can move or change optics without screwing up the placement. If your AR10 and the other mount have true picatinny mount then you should be able to move one to the other. It seems like in this situation you should go with the picatinny. Good luck.