i picked up a new G40 MOS. i put a red dot on it. it had the dreaded first shot out of group syndrome. no mater what i did, could not get first shot with the second 4. i did an experiment one day. i locked the slide back & loaded 1 round in mag & shot a six round group that way. it was the smallest group gun ever shot. i ended up getting a lone wolf barrel & the problem was solved. better case ... More @Wikipedia
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