I inherited a 16 ga. Browning Auto-5 from my dad that from the serial number appears to have been made in 1932. Having done some research, I know that it was originally made to use the 2 9/16” shells, but is there an easy way to tell if it has been “converted” to accept the 2 ¾ shells? My dad never used it, but I know that at one time he loaned it to my uncle and cousin and remember as a kid being told how they had it “fixed” to use the US ammo. I did use it once to shoot skeet (with 2 3/4), and had to manually eject the shell after every shot. Not easy. So I guess my other question is that if it has been converted, is it still safe to use the original 2 9/16 shells it was built for? Thanks