I have a 1939 era M12- 28 ga. 28" solid rib barrel choked WS-2, and a friend has a 1950 era M12 28 gauge 26" plain barrel choked Imp. Cyl. They both pattern dead identically on paper with AA skeet laods- 30 yard circle 35 measured yards. The late Jack O'Connor in his 1965 Shotgun Book detailed the WS-1 and WS-2 chokes developed in the 1930's by WRA- and compares them as to amount of restriction and radius to the std WRA chokes- from full cyl. to full--
My only objection to the great M21 is their weight- 16 and 20's on the same frame, 12 and 3" 12 Duck models on the same frame- economy of scale in production perhaps, but not the same "in hands" feel of a fine SLE 12 bore- IMO!! But like the Model 12 and even the Model 1897, built to last forever-
