Evolution Gun Works Picatinny Scope Mount Long Extrusion w/Slots .650in 16in Black. The EGW Scope Mount Extrusion is taken from the same metal rail extrusion used by Evolution Gun Works in manufacturing their standard Picatinny scope mounts and comes in unfinished silver metal. The sight mount extrusion is ideal for custom gunsmithing and scope mounting solutions. This Evolution Gun Works scope mount extrusion is part of the Rifle Scope Mounts Rings and Bases family of gun accessory products available from our online store. Specifications for Evolution Gun Works Long Picatinny Rail Scope Mount Extrusion w/ Slots: Length: 16 inches (46701) 24 inches (46740) 32 inches (46711) 36 inches (46750) Height: .650 inches Tolerance: Accurate to within .0005 inches Features of Evolution Gun Works Long Picatinny Rail Scope Mount Extrusion w/ Slots: Unfinished silver Ideal solution for custom scope mounts Package Contents: Evolution Gun Works Long Picatinny Rail Scope Mount Extrusion w/ Slots Evolution Gun Works 16 inch Long Black Picatinny Rail Scope Mount Extrusion w/ Slots