cleaned it up and took it to the range today. First few mags, same problems. Then I tried 147 JHP and it locked back.. Hooray!!! Then tried 115 FMJ again, and it didnt lock back. So I asked some questions, and an attendant test fired it with 115 FMJ and it locked back he said. Then I took my last 5 FMJ rounds and did what he said. Apparently, I wasnt locking my wrists together, but I was holding it tight. But I went back in there, last five rounds, locking my wrists and it locked back. My sign is stupid.