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Ruger 10/22 rail screws have been stripped on an old gun . I was thinking maybe helicoil either standard thread or slightly larger so ;

Anyone know the standard size please ?

Anyone gone up a size and or helicoiled the action ?

Thank you ...

I’ve gone up a size just gotntheblocal
Machine shop to tap it.

Yes, that is the best solution, small helicoils are not ideal for such issues and require tapping to the helicoil thread anyway.

IIRC the original holes are tapped 6-48, tapping them out to 8-40 or 4x0.7 should work.