I have a full size 1911 and its failing to eject quite frequently. I'm fairly certain it's the extractor. Does anybody know where I can get a replacement extractor?
It's been a while since I messed with a 1911 that had an internal extractor, but I recall some of them being a PITA to tune properly. Your best bet would be to order one from Midway or Brownells.
First, are you using factory ammo or reloads? If your using factory rounds and having problems, take the slide off and see if the extractor will hold an empty round against the bolt face. If it's lose than you need to remove it and "bend" it to tighten the amount it holds the case against the bolt face. If you are using reloads, that could be your problem. If not, you will have to do the same thing as before. You didn't give a whole lot of info to go on.
Most likely what Beauxdog said. The extractor needs to be tuned a bit. I just wanted to also say that some parts for a 1911 aren't a drop in fit. Some will need to be fitted before they will work properly.
Don't forget that 1911 magazines quite often are the problem. I have fixed many 1911 by simple installing a Wilson Combat mag and the owners looked at me and said "Are you freakin serious!" But as far as the extractor it depends on the make of your gun. How old is it? Rounds count, Guess? Make of the gun or a picture would help me determine what extractor you are in need of. External or internal. Sometime slide length comes into play also. 3, 4 or 5 inch slides.