redfield base screw sizes?

[rugersworld]

Looking to but a redfield 03-A3/A4 base from either midway or brownells - the one with only 2 screw holes.
My question is what are the screw sizes?
I want to order taps and drill bits at the same time if they are different than 8-40.
Thanks

Information

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[Chuckindenver]

8-40 screws..#28 short wire carbide drill

[rugersworld]

Thanks Chuck.