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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...

Actually, on the Model 12, the sporting and riot barrels taper. The Model 12 trench gun barrels do not taper. That is why when the Military converted some Model 12 riot guns to trench guns they...

The photos Jim posted for me are all from original trench guns. That it how the bayonet adaptors fit on the different guns. On the WWI 1897 trench guns the bayonet adaptor stud is flush with the...

Winchester did rivet the heat shield to the adaptor. They then filed the rivets down. If you look at a WWI 1897 heat shield you can't see the rivets on an original condition gun. On the WWII Model...

The swivel on my Model 12 trench gun is exactly 3-1/2 inches from the end of the buttstock wood to the edge of the swivel base. The muzzle is flush with the end of the bayonet adaptor (there is no...

"The slide sleeve cap apparently had some strange, sloppy work on it and I wonder if anyone can shed some light on what and why-"

It's damaged. Not sure how or why. I'd buy a replacement. You...

It should be tapered (narrower towards the muzzle end). Only the Model 12 trench gun barrels have no taper.

If you use a Winchester USGI bayonet adaptor rather than an aftermarket one you will most likely have to use shims to have it fit properly because Model 12 riot barrels taper towards the muzzle...

The Cutts was added later. The barrels on Model 12s with factory installed Cutts do not have choke markings.