Converting the SL-68 II into a shotgun
I'm about to get my hands on a SL-68 II with the sole purpose of making it look like a shotgun. Modding up the body to look right isn't the problem, it's the really short pump stroke. Before looking at the schematics and seeing that the pump rod was threaded I was thinking of sticking a spring into the grip where the rod inserts, but as I said, with the threading and how the gun works, I don't think that will work at all.
So does anyone have any idea how I might increase the pump stroke length? If I'm going to make this thing into a shotgun I want it to somewhat feel like one, all the way down to the stroke.