Fron't sight drill bit size

[AzShooter]

I have to replace the front sight on my 617. What size drill bit is used? I know that 1/16 is too big.

 

[BMCM]

I have to replace the front sight on my 617. What size drill bit is used? I know that 1/16 is too big.

Number 55 drill bit to make the hole in the new sight tenon then enlarge the hole to perfect size with a number 54 chucking reamer.

Posted the tools & steps in this thread a while back...

625-6 In for spa treatment

Cheers
Bill