I've always snapped the barrel shut on my 35E and have seen no issues as far as wear on the latch. Probably a good idea to keep that latch bolt greased, though. Back when I was shooting the 35E indoors in the basement, I used the Williams peep on it and did fine. That long barrel with a peep on the receiver makes for a very long sight radius. Outdoors is a different story, though. I really need a scope on my air guns to be able to shoot whenever I want, thanks to being surrounded by forests that cast shadows on the range and that's on sunny days. Up here in the north woods, we get long stretches of dark, cloudy days that make it tough to use iron sights.