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The older Weaver rail is different from the Picatinny rail. The significant difference between the Picatinny rail and the similar Weaver rail are the size and shapes of the slots, where the Picatinny rail has square-bottomed slots while Weaver rails have rounded slots. An accessory designed for a Weaver rail will fit onto a Picatinny rail whereas the opposite might not be possible. Some accessories are designed to fit on both Weaver and Picatinny rails, most Picatinny devices will not fit on Weaver rails.The older Weaver rail is different from the Picatinny rail which is discussed in [[Weaver Dovetail or Picatinny]]. The significant difference between the Picatinny rail and the similar Weaver rail are the size and shapes of the slots, where the Picatinny rail has square-bottomed slots while Weaver rails have rounded slots. An accessory designed for a Weaver rail will fit onto a Picatinny rail whereas the opposite might not be possible. Some accessories are designed to fit on both Weaver and Picatinny rails, most Picatinny devices will not fit on Weaver rails.