went to the range yesterday and shot about 150 rounds. After about 2 mags after cycling 2 rounds the hammer did not lock back. After resetting the hammer fired fine for a few rounds then same thing. Happened maybe 4 times. Ammo was American eagle 230 grain and also perfecta 230 grain. The pistol has only had about 500 rounds through it. This is my first 1911 so I'm in the dark abit. Have never had this issue with any other pistol I have owned. Any ideas are welcome. Thanks in advance to anyone who postes!