Digit might be able to chime in here, but as far as I know it was only the very early 1st gen NEA's that had any issues with this. I know personally of one NEA bolt that spat a bolt lug, but that was at a reasonably high round count, and losing lugs is a hazard with AR bolts from a variety of manufacturers from what I've read online. The great thing is that unlike all the other brands in NZ, NEA has local support so replacement bolts came out overnight under warranty.
I've got a gen2 NEA and I must have put at least 5,000 rounds through it without any issues at all, and from what I've heard this isn't a problem on their newer rifles.
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