When i bought mine used it hade a scope on it and I want to put the original rear sight on it. Does any one know the original part number from williams which i believe it is. i was thinking of putting one of these on (Williams FP-H&R-TK Receiver Peep Sight White Systems H&R Buffalo Classic and Handi Rifles with Target Knobs Aluminum Black from midwayProduct #: 572292 Manufacturer #: 70260 ) but i don't know if it's the one that will fit right on or needs to be drilled and tapped'ed. Any help would be appreciated.