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Lyman RS-57 peep on GPR

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SDHNTR

32 Cal
MLF Supporter
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I’ve got an Investarms made Lyman GPR. Not sure of the exact vintage. I’d like to put a peep on it. Will the Lyman RS 57 fit this model without drilling? It has the third smaller screw in between the mounting screws on the tang. See pic.

And then the second question is where can I find one? They appear to be out of stock everywhere.
 

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