Hey Scout, where are you located? If you're in the Detroit area, Impact airsoft has a great tech who should be able to help you out. If you're around Lansing, I can take a look at it if I can find time.
Also, if you posted some pictures of the problem it would make it a lot easier for us to help you.
Good luck fixing your gun!
King Arms M16/M4 DMR.
King Arms 14.5" M4
King Arms 11" M4