zeta otaku wrote:Any gun gurus identify the model of shot gun pump grip on the front of the thrower?

That reminds me of the rubber grips they used to put on safety cover installation tools for use in swimming pools. Pools were my fathers line of work, and I... might of sort of cut the grips off of a couple of his old tools and used them for early proton packs.
The ones I was after in the '90s had the large finger grooves, but older ones were just cylinders with lines like what you see on the new wand. The image above has those lines, and I remember them well because I wanted to find a way to fill them in for accuracy.
Unfortunately, I can't find an exact image that matches my memory -- tools like that from the '80s are pretty rare to see online -- and in any case, a shotgun grip makes way more sense in Oklahoma than a swimming pool pry tool. Egon could have found on in the homestead or bought parts in town.