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I number ID all my mag bottoms with Dremel Engraver so that if it presents a problem I can isolate that mag until I can get problem resolved or trash it. Actually had one go south on me that had performed well in the past this last week at range. In any case, I have multiple mags for all my pistols and they all get some workout when that pistol goes to range, so to answer OP's question - Yes, it is a specific working mag. However, as in life there are no guarantees - the last time your pistol or revolver worked correctly may be the last time it worked correctly - and you'll not know until you fire it again - odds are in your favor it will be fine, but no guarantees. I also carry one to two spare mags on weak side just incase.