My son is having problems with his new Rock Island 1911. We have tried 2 different mags and 3 different brands of fmj ammo. It keeps having what I call double feeds. The extractor fails to pull the spent case all the way out of the chamber and the next rd jams into it. I looked at ria website and could not find any contact info. Can I adjust the extractor? maybe a different problem? Thanks for any advise.