I have not shot long guns enough on a regular basis to be that good. Now at 70 the eyes don't help. I have seen a few reasonable .22lr with peep sights but was not sure how they would work with older eyes. 1) Are they similar to the Magpul buis rear sight apeture types? 2) Would they help or hinder old eyes? 3) Even with good eyesight I can't see how they would be good past 25 yards for good groups. Any info appreciated. Might be nice to try something different.