It appears that the rib las also been decked, flattened, if that’s the case then I would say it was possibly done for a long mount of some sort. It seems that the early attempts to mount scopes on handguns was done with modified rifle mounts, I think it makes sense because they only had rifle scopes to work with at that time. You were definitely on the fringe trying such things back then. I’m pretty sure the King ribs were attached only at the rear and pinned through the front sight blade, don’t have one though, maybe owners of King modified guns could confirm.
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