I know two places where you can get info if you don't get enough here. One is the "Doublegun BBS" forum on
www.doublegunshop.com/BBS Several Husky enthusiasts there. Another is the "Swedish Commercial and Civilian Arms" forum on
www.gunboards.com/forums It is 'way down the forum list; keep scrollin' until you find it. Several Scandinavian posters there who really know and love this make.
What I recall of 51s is that they are excellent guns that are sometimes short-chambered and over-choked by American standards. Both easy enough to fix.