Has anyone gotten additional apertures for the Williams sight. I see Midway has a WGRS regular and twilight model, in .050, .093, and .150 ID. I measured the ID of mine and it is about .090, so I guess it is a .093. I think I want a smaller one because when sighting, the rear circle is much larger than the front's outer ring. I am thinking about the .050 twilight model. Any experiences with these options?