We need 16 ga. shooters, else where would our next generation of handloaders come from?
Seriously, your bud may come to have some buyer's remorse over this gun, but I haven't heard anything that can't be fixed or ignored.
Heavy gun - probably, but he's a duck hunter and accustomed to discomfort (and heavy guns).
Nothing wrong with the safety unless you hate it. I don't. I am the second owner of an old, gray Model 11 made in 1919, and it hasn't killed anything by accident yet with any of the 100K or so rounds fired through it.
Choke probably is too tight, but that is a $25 fix.
Shells. Well, probably he will need to open the ejection port 3/16" if it hasn't been done already. The chamber will be OK, but the empties won't eject if the port is short.
A poster from Mexico, where ammo choices are rather limited and handloading is forbidden, shared with us an innovative way to use 2 3/4" shells in a short-port gun. IIRC, he used a 1/2" hole saw in a drill to cut half way through the hull in the center of the crimp. The extra 1/4" went out the muzzle with the shot and wad, and a 2.5" fired hull ejected. The post was a couple of years ago; I wish I could recall the man's name.