While 20" barrels would swing very fast for upland game,and with choke tubes would let it pattern well. I firmly believe 24" to 26" barrels is the best length for allround use. They still swing quickly,while allowing for smooth swing thru and good balance. Also-no matter what barrel length you choose,with today's powders and loads,he'll lose no range from the shorter barrels-especially at upland ranges. The fastest handling shotgun I ever had was a benelli bought cheap because of a bulged/split barrel close to muzzle. All I did was cut it off at 23",ream and thread barrel for screw in choke tubes (benelli of course since I already had them),and reattach front bead.