Hi-lux ruger one picatinny base - Hi-Lux Optics Ruger No. 1 Mount All Steel 1 Piece Picatinny Bases

I have a Ruger one in .243 caliber.Product easy to install and worked as advertised. No complaints. If you are looking for a solution to get enough eye relief for your scope then this will work. Ruger one is a great gun but mounting scopes can be an issue due to its design of having scope rings in fixed positions which does not allow much flexibility when trying to mount a scope and get the eye relief right.I mounted a 4.5x14x40mm Nikon scope with low profile Weaver rings with no difficulty(Ruger rings won't work). Allows you to move scope back approx 2 inches giving greater flexibility for adjustments. Not bulky ,looks like it came with the gun and takes minutes to install. Since I already had the scope, this was an easy fix compared to buying a new scope.