Does anyone know what size the rear sight retention screws in the 999 Sportsman revolver .22 are? A 6x40 is too small and an 8x40 is too big. When I look at the parts diagrams they don't show the size. Thanks in advance.

If you have the part number, Numrich Arms might have the part
http://www.gunpartscorp.com/

Thank you. I was there a couple of days back and none were listed.

I may have some in a parts bin, complete sight set.