I have an opportunity to buy an older 870 wingmaster ,2 3/4 shell only, with fixed improved cylinder. I would be using it for shooting clays for fun, dove and quail hunting. My question is do you guys feel that the fixed improved cylinder is sufficient for what I would be using it for or should I try for one with the screw in chokes? Also, is their really much of a difference in pattern with I.C. vs modified vs full? Thanks for any replies, J-P