I have a '39 16 gauge Field Grade. I just got off the phone with Morris @ RST shells, and as he has the same gun, he cautioned me to have a gunsmith be sure all the screws are tight, so as not to ship the wood around the side locks. Who knows about this? I have a pretty good double gun guy nearby. I just want to have a clue as to what I'm talking about & to learn more Thanks Mark