Originally Posted by P B G
I use that same rear sight on my air rifle, and have not been able to discern a whole heck of a lot of difference between the small apature, the large apature, and using the rear ring and no apature in function.
Behing that I don't do lots of bench work with anything, just having an open ring functions well enough to blast what I'm looking at.
My now deceased dad was a big believer in peep or receiver sights. For hunting purposes he'd unscrew the aperture and just use the rear ring without it, sort of a "ghost ring" almost, and we could never tell much difference in the size of the groups, plus it was lots faster in hunting situations.