i picked up a nice browning double auto a couple weeks ago... this 1 has a bright alloy-looking, non-blued finished receiver.... i'm not sure if its a twelvette or twentyweight.... the only thing i've found in an attempt to identify it is it's weight... the twelvette is supposed to weigh 6 3/4 lbs, the twentweight 6 lbs....to my limited knowledge the double automatic had a steel receiver.... anybody got any books or reference material to look at???... thanks, jim