Nobody knows, huh? I did some more searching to find other variant names for the Hiawatha VR130. It was also the Steven's Model 77 and the Springfield Model 67 (http://www.pmulcahy.com/pump-action_...otguns_s-z.htm). I have zero gunsmithing experience but if it means filing on this slide to make it fit I guess that's what I'll try. My thought is that since the new part has a notch where my old part has a dog-ear there's not anything going to be any additional metal there that might interfere with the action. If the new part's solid-side interferes (because my old part is notched) I'll just file a notch into the new part. If the tab on the back interferes, I'll file that off too!
The only other difference I can see is that thumbnail shaped divot next to the ramp. My old part has it further back than the new part.
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