Mine was a Rock Island Armory compact 1911 that I put 800 rounds through and considerable time trying to fix it. What it would do is randomly fail to return to battery. Then it would all of a sudden not be able to pull the slide back all the way to chamber a round. Then it would fail to extract the empty. and all of this at random. Just when I thought I had it running right it would screw up again. I beat the pos to a pulp and melted it down.