Winchester used special purpose barrels for the Model 12 trench gun. These barrels do not have a taper like the riot barrels do. I have never heard that they used commercial barrels on trench guns to keep up with production nor have I ever seen an original production Model 12 trench gun with a commercial barrel. After WWII the military decided to convert many of its riot and long barrel Model 12s to trench guns. They brazed a sleeve on the muzzle end of the barrel to make the bayonet adaptor fit properly. The sleeve had the three transverse groove cuts on the bottom for the bayonet adaptor screws.Information
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