Could be hand engraving on the M 21 SxS and laser on the O/U.
No. It's the fact the O/U is a machine made gun just like their Iverness which is a copy of a Rizzini. These guns are made with a machine and are of monobloc construction. The Model 21 SxS's have chopper lump barrels and are much more costly and difficult to make. This O/U 21 is an Iverness/Rizzini a little differently dolled up. Simple as that. And IMHO this O/U is NO Model 21 and rather, simply a gimmick for Galazan to make more money.....just my opinion though.
