So they changed the receiver to accommodate the longer 3" shots??
I don't recall Winchester ever offering a factory conversion of a Model 12 from 2/3/4" to 3" chambers. The Heavy Duck Gun is a heavier built gun in many respects. The barrel wall is thicker, the bolt is different, as well as the shell carrier, the buttstock has a lead counterweight etc. etc.. I do sort of, but faintly, remember Simmons at one time offering such a conversion but I could be mistaken on that.


















































