Hey everyone:

Can anyone tell me the correct size of the sideplate screw holes on a blued 1936 S&W M&P 4 screw. I mainly need the upper flat head thread size and the (2) round head thread sizes. I am suspecting they are either 8-32 or 6-32 on the side plate but I am just not sure.

Two of the round head threads are rolled over and missing the screws. I bought the screws but need to clean the threads first before I install the screws.

Should these threads be cleaned up with a 2 flute or three flute tap?