The top gun is the one that unseated my M17 from my "stable". A very early Ward's Western Field Model 30.
It's a 20 as well (both guns pictured are 20s, the bottom one is a Stevens Model 620). The cross-bolt safety on almost all pump shotguns slows me down just a bit (because I'm a southpaw), and that doesn't work in ruffed grouse country. This 520 clone also fits me shockingly well. Most likely because it's not a draw-bolt gun and the wrist is very thin, as is the comb. Cast then becomes a non-issue. It is also the lightest 520 I've ever run across, at 6 1/4 lbs. The absolute polar-opposite of a fine double, but effective, none-the-less.
Another interesting tidbit: the Model 520 was Browning's first hammerless pump design (in 1904), the Model 17 was his last (1915).
