I'd find out what he did to tighten it up. If he peened the lugs or hinge pin it should still be ok for a while but will eventually shoot loose again. If he replaced the hinge pin which is all most loose guns need then it should be fine for many years. If the barrel moves up and down it's the locking lugs but most guns compensate for worn lugs by the release lever moving further to the left as it wears. If the barrel moves side to side it's the hinge pin.
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