I have a M2 this will be my second season hunting with it I hope the gun shoots way high. I have the thickest shim in C i've added an easy hit sight heck I even tried a limbsaver pad, still shoots high I got to reading some earlier post and found one where a fella had the same problem and he used washers so Fri. I tried it I only got to shoot a couple times because it was getting dark and seems like my pattern is now 50/50 maybe a tad higher, before when I shouldered my gun I could see the rib all the way down now I see where the rib steps up and just the easy hit bead, hope this works I will know tomorrow.