So I just bought a new fiber optic globe sight for my shotgun. Looking forward to a nice day that I can take it out and give it a try. To answer questions in advanced, yes that's and adjustable choke. I still haven't decided whether or not the choke is really that good, I mostly just leave it on improved and don't adjust it too much. I suppose if I played with it more I could tell you if it was worth getting, but I never did get to go out hunting this last year. Way too busy with work and school, but this year I should have more time. The sight is super bright, and a lot easier to focus on than the old bead was, but if I find out that I don't like the new sight all I have to do it loosen the scres on the new sight and it slides right off.