Model 74 Serial# 27986 .22 short magazine throat parts|Winchester .22 Rim Fire|Forum|Winchester Collector

Need some help with finding the screw that goes into the magazine throat. This rifle was extremely dirty and I disassembled everything except the bolt. Anyway, somewhere along the line I lost the screw; it has the same thread pitch as the rocker spring screw. Does anyone know the pitch and length or know where I can get a replacement? It doesn’t show on the part explosion I have from Numerich. See picture for detail. Thanks everyone for any information.