A lot of good working guns mentioned here but I think the queen of SA’s at least as regards weight is the Ben UltraLight which is simply the Montefeltro after a diet. The 20 is ~ 5 1/4 lbs and the 12 right at about 6 IIRC.
In both you sacrifice some magazine length and are limited to two therein; with one up the spout, you have three. I’ve never felt I needed four at least for my kind of shooting. Besides, pushing another into the magazine is that quick.
As to recoil, I’ve never thought a 20 needed any mitigation such as a gas system. Even in the 12, unless you go the 2 3/4” heavies from Fed, Fiocchi, or B & P (like 1 3/8 oz at 1400-1500), recoil is hardly noticed in the field; at least by me. Those, however, will get your attention, but in my world are not needed.
For me as I have gotten older, I’ve wanted lighter.
