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Things I liked: The o rings fit my Air Arms S400 as advertised. The installation was easier than expected. I used a blunted toothpick to ease the ring into it's slot, a good light and and a way to hold the action so three hands were not needed.
Things I would have changed: It's always a minor shock when shipping and handling doubles your out of pocket cost for an item. I'll think about bundling this with a pellet order next time. My order was placed on 12/21/17 and received on 01/05/18; a long time to be without my rifle.