I think I've narrowed it down to one of the 300-series....problem is, when I look at the numrich parts diagrams things don't quite match up. This gun has what I guess you would call dual lugs on the barrels....
All the 300-series appear to have a single lug set-up. Also, this gun has screws rather than pins through the receiver. Only the 335 appears to use screws, but the 335's internal parts don't look the same(in the diagram, anyway). Here's a shot of this gun's internals...
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