I have had doubling experience with one repro single trigger and two late Rem Parker single triggers which I believe the repro trigger was patterned after. In all three cases the doubling resulted from the selector not properly seating in the L or R detent. There is a small cross pin that retains the selector and detent spring which can work loose and prevent full movement of the selector. Even the smallest misalignment of the selector will cause the trigger mechanism to trip both sears simultaneously. You must remove the stock to examine this condition and make sure the pin is not contacting wood. I hope this helps.
Carl.
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