OK-- field strip both a M12-pre-1960, and the same yom M37. What's behind the bolt of a M12 when it is in battery, and a live round in the chamber ahead of it?? Now ask the same question about a M37-- granted, John M. Browning developed the M17 Remington, which morphed into the Ithaca M37 some years later--Ask your self how many ATA Cham[ionships have been won with pump guns?? OK- of that number, how do the Model 12, Model 31, Model 870 and Model 37 Trap guns claim their share of the trophy cups and money awards?? I rest my case.
