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I ordered a couple of receivers recently to fit to barrels I already had... The barrel locks up tight on this receiver but it will close on a .003 but not a .004 feeler gauge... It closes on the .002 feeler gauge and I can't pull it out like it said in the faq's... Should I leave it alone or try to shim it??? If I shim it I'm sure I will have have to remove a little metal put a thick shim and work it back....