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Thread and size of screws on top of 590 and 500s

action1

.22LR
I purchased a large batch of L.E 500's. I removed the screws to install 590 Ghost Ring sights and they seem to large for the tapped holes.
Any idea what the thread pitch and size is?
Thanks

Anthony
 
Depending on the year receiver mounting holes are pre 1997 were 6-48 and after are 8-40
 
photo.php
photo.php


Some pics of the tapped out bigger holes on a batch of L.E 500 trade ins we are getting ready to put out.

Anthony
 
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