P Series 2 Piece AR-15 Picatinny Scope Mount with Integrated Rings Matte Finish By NIKON OPTICS ITEM DESCRIPTION This 2-piece design allows proper mounting height and proper fore-aft positioning for proper shooting technique with comfortable eye relief. These rings come in both 1 inch and 30mm. has the 1 Inch currently in stock.. Specifications & Features: Height (from top of rail to center of tube): 1.4" Piece: 2 Tube Diameter: 1"