depends...if its a yugo 59/66 model thats natural for most of them that are bought in used condition. Shooting one time..and not having the bolt go back to battery could be due to a gas leakage in the gas valve...you might need to also check for any built up cosmo inside the bolt/firingpin/etc...and just double check its spotless, also check your springs too.
Good luck..i had a gas leak prob with my yugo sks 59/66
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