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Advice for installing proper screw length for optic

How do i ensure i have the proper screw length to install optic on pistol? I have size for screw but not sure on screw length.
What optic are you installing onto which gun. Honestly, it’s kind of a crap shoot because there are so many combinations. I have a collection of of different screws (4-40/6-32/M3/M4) at different lengths exactly because of this. I also have metric and saw screw cutters just in case. It’s hard cutting screws with a wheel and I don’t have a belt sander. Filing screws down just plain sucks. You can buy a pretty comprehensive package of optic screws from Vortex.
 
Installing a Holosun 507k on HK CC9. I did purchase a package of different sizes and I guess I will do the trial and error method. From what I understand it's better to be a little shorter than longer. HK says M4x0.7-6 Holosun says 6-32. As long as the gun works and the optic doesn't fall off I guess i'll be good to go. Thanks for responding back to me.
 
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