Ruger Mark IV front sight screw size

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gregp74

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Jun 27, 2015
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Rockford, IL
I picked up another Ruger Mark IV Target today and I'm running into some troubles.

My previous one had a slotted screw holding the front sight on. This new one has a 5/64 hex head. I'm trying to get it out so I can install my Williams Fire Sights, but it appears to have come pre-stripped out from the factory.

My plan is to just gut a slot in the sight and the screw & use a slotted driver to get it out. I'm still going to need another screw though to put the other sight on. Just wondering if anyone has the specs from that front screw.
 
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