I just got my new Crosman 2240XL with the Crosman red dot sight. The gun does great, trigger needs some work though it's uncomfortably stiff. I'll be getting the adjustable seer that was recommended by biohazardman in another post, but first I need a good sight. The Crosman one is what I expected for 15 bucks, it's kind of like looking into a laser pointer. I've got my eye on these Hawke red dot sights. Looks like they come in a few different sizes from 1x20 to 1x30 and they will fit right on the 3/8 dovetail without an adapter. It costs almost as much as the gun itself but I'm looking for quality since I intend to have it for a while. My questions are how do they do, whats the best size for this gun? Please share your thoughts.