The zero for all Russian small arms, AK thru PKM are done the same way. Set the rear on "n" (in most cases) and fire at 25m. Adjust elevation on the front sight as well as windage. Only the PKM and limited versions of the RPK have rear windage. If you guns does have this make sure it is set to neutral when doing the initial zero and make windage corrections at 25m with the front sight.
Hope this helps.
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