I'll try to articulate this as clearly as possible so no one will reply with some kind of comment like I'm an apologist at best.
Have a look at page 9, 4 of 10 replies are about how bad NEA is, no additional value beyond clutter that detracts from the discussion. Those accused of being Shills, etc. are in most cases just asking for an honest appraisal of the current crop. Instead the discussion is constantly being drown out from machinists to logistics experts adding zero value to the discussion. I also accept my part in this frequently doesn't add much to the discussion, in the end though, I'm trying to filter out the guys who insert the same tired argument or some unknown that drops an, "I had an NEA it/they/we sucked", with no further comment.
One part failing is just that, now if Barrel Extensions start popping, what does that tell us? As an industry insider has already pointed out batches of parts can be made too hard, I'd assume that a batch would be collectively too hard/soft/etc., if I'm not mistaken the parts are made in batches not one at a time. Also as far as I can tell NEA uses common steels and alloys and hasn't changed the design of any components so radically as to make them unreliable. The problems all appear to be related to QC, and Inventory Control. I won't even try to document what appears to be incorrect time lines as I'd need to make some kind of spread sheet to keep track of who said what and when (availability of Gen-1 to Gen-2, was there even a Gen-1 7.62X39?).
The longer I follow the NEA saga the more inclined I am to believe it's impossible to judge just how many defects they have and of what nature. I've had plenty of defective items in my life. All by degrees, regarding rifles, the only one I can say was pretty close to perfect was a S&W M&P-15. Every other single rifle I purchased new had some kind of defect, from mildly annoying to I'm not even going to try to shoot it. All but the one I wouldn't even try to shoot turned out to be very good at worst when it came to its purpose, holes in paper. NEA problems can be sorted into two groups, defects related to a batch of known defective parts, and others. I would like to know what return/repair rate would they have if you removed the stuff related to failure of [known bad] batches.
Glad you got your rifle back by the way. I'd be a little wary but I'm pretty sure the parts they didn't replace will be ok judging by the lack of overall damage. The carrier is the part I would have liked replaced as well. How did the charging handle give you a kiss? Part of why my initial vote was leaning to pressure, but I'd assume a little torque on the carrier could bring it along for the ride.