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I bought a used 39AS recently, that came with a Williams FP-39 on it. One of the mount screws that I guess came with the FP-39 needs to be replaced with a little longer screw (the first couple turns of thread on the receiver are toast, and the screw isn't getting a bite--it only goes into the receiver about an 3/32nd of an inch, so I've got some room to play with. There are good threads still remaining.).

Can anyone tell me what the screw thread is on the receiver for the peep sight mount holes?

Also, I'd like to replace the elevation lock screw on the FP-39 itself as it is chewed up a little bit. Does anyone know what that thread is?

Does anyone know a good place to buy replacement screws for the Williams sights? I've looked at Midway, Brownells, Williams website, etc., and can't locate them. I'm going to call Williams tomorrow and ask them if I can order some replacements direclty.

Many thanks!
 

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I believe 8-40

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