Wow,this thread has been an eye opener to say the least! I personally have never owned a full-auto mini-14,and the only complaints I've heard deal with inferior mags causing problems. I've had nothing but good luck with even the cheapest mags,with mini-14's.Of course it's hard to compare the two,because the AC556 would be slightly more prone to problems (on full-auto anyway).
Hey Paul, hows the extractor look? How about the extractor spring? Possibly the spring is prone to fatigue(cause it's lost it's tensile strength)? How do the rims on the spent shells look? Are the extractor marks deeper on the first few rounds?Then when the spring gets "tired",it does'nt get much of a bite,which you could probably see. I know the extractor spring causes problems for the AR's,hence the "D-fender",that little blue donut thing you put around the spring.
But treedawg,don't feel too bad,at least you live somewhere where you
CAN own full-auto firearms! The police chief,sheriff,county attorney,have all gotten together and decided there was too many class 3 firearms in my county.So for the past few years,no one who lives in my county can get the needed signature for the forms. There has been people who tried to go to court,but have failed. It really S_CKS!