I've aquired a Model 12 trench gun that did not have a butt plate on it whe I got it. None of the Winchester plastic butt plates seems to fit it. I've both tried to fit one off my other model 12's and have ordered three more. No luck. I read where Winchester also made a steel one for the trench and riot models if so ordered. I can't find one nor have I ever seen one. The inspectors mark is W.B. and has the crossed cannons under it. It is 4 3/4 inches long, 1 1/2 or 1 9/16 inches at widest part and the screw holes are 3 1/2 inches center to center. If anyone has any info that might help, I would appreciate it.