Sorry,  I didnt want to ask this question in an older thread.   I perfectly understand that the wiggle (or slop) doesn't effect accuracy but it does give it a cheaper feel in my opinion.  Before I spend alot of money I was wondering if your MK16s's were loose to begin with or loosed up after shooting a couple hundred rounds?

From the videos I've watched the receiver pins seem to be pulled out so easily during disassembly that I assume the tolerances are loose.

You assume wrong....