Innovative Open Handle - Much Larger Space and Lighter Weight for Easy Carry! The Only High Riser with Integral Picatinny Rail that allows Sights See-Thru. BridgeMount(r) Modular Design with Under Bridge Space for Additional Accessories! Build Your Own Double or Triple Rails System. 13 Slots Cantilever Rail at 1.8" High, 139mm Rail Lenght, 55mm Mounting Base, 5oz