tHE ONLY "ROUGH PUMPING" M12's I have encountered are the short-lived Dog-Leg slide rod style, M12 3" Mag has those from about 1950-1953--I have 2 M12 3" Magnum duck guns- 32" full solid rib circa 1949, and a 30" full solid rib circa 1939--both with the std. straight style slide rod. Both are smooth as glass, and pattern like gangbusters with any steel shot load I care to run through them. I don't shoot the M12 28 gauge enough in a year to note some of the details you other gents have espoused herein. RWTF

"The field is the touchstone of the man"..