I have a ban era Maadi AKM. One of the neutered features is it lacks the side optics rail.

I've been back and forth about it but have decided to keep my rifle as "genuine AK" as possible so want to add a side rail rather than a handguard or rear sight replacement setup.

Are there any issues with adding a side rail? Any do's or don'ts? Any good suppliers or bad suppliers?
How are they supposed to mount? Rivets?