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loose enough that it may not give consistant down range results
tight enough that it won't pop out on you.
'fairly normal" wiggle for a Chinese rifle
if it were my rfle and one I wanted to squeeze the best out of it, that oprod would be replaced.
but ..... not a safety or functionality issue as long as it's not disengaging at the take down notch during rapid fire.
I have a brand new Springfield M1A National Match and that is similar to the amount of play mine has (mine may be slightly less). I will post a video when I get a chance.