I just had to add a shim on top of my rib of a new O/U I got. The gun shoots too low and I wasn't hitting anything with it. So, I put a 1/4"x14"x [1/4" to 1/16"] square dowel on the rib just before the middle bead. It aligns with the front sight perfectly now.
The only time I could hit with it was when I did the figure-8 thing but I dont' want to have to do that. It's cheesy, imo.
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