I agree with everyone above as well,shoulder the gun. If you're consistently looking down the rib the comb height will need adjusting. Some guns come with shims, some don't.
I'm shooting an SBE I Bought off the ee. I'm very happy with it. I was shooting a beretta pintail before it and it is a good gun as well. Only a 3" chamber though. I don't use 3.5" shells very often, mainly later in the season for geese.
I've sort of gone backward for the ducks and am shooting 2 3/4 shells again over water. My kill rate went way up. I'm thinking due to less recoil.
Anyways this is my opinion. There r lots of well made guns a available these days.
Good luck with your search.