Gas key shearing off sounds like an over-torque issue. I'd replace them with quality screws and drive on.
Slash has heavy buffers for 5.56, and soon 9mm UCIW stock setups. http://www.heavybuffers.com/
I'd agree that cutting springs for a standard receiver extension is bad, but this is a different application with a different length receiver extension. They could make a short one, and it would perform just like a shortened one, save the tidier ends (and would probably cost more). Replacing buffer weights is easier than a barrel swap, or assembling a lower, by a large margin.
Not sure if these work with the NEA stock, but I'm pretty sure they are the same.
Ooops, these are for the shortened carbine type receiver extension; not the NEA style. I have heard that Slash has a buffer from an NEA stock, and there should (hopefully) be some other options soon.
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