Ok Ian, think about it this way. You are looking down the rib of your posh, highly engraved trap gun, you are seeing enough rib for say 80/20 pattern placement. If you could then shove a wedge between the muzzle end of your rib and the muzzle, while still seeing the same rib picture, the muzzles would be lower and shoot flatter for the same amount if rib seen.still don't get it mate. If your right then why not use a trap gun with high comb ?
if its all about peripheral vision why not use a high rib ?
I am not knocking it or saying anything derogatory I just cant get my tiny brain around it.