Your understanding of milspec is wrong. It's just a loose set of numbers contractors have to meet to sell them under that contract. Some milspec are very tight, some are loose. Ar15s are loose not for reliability, but for interchangeability in the field and across all the manufacturers who have contracts to make parts. You can machine a very tight ar15 within milspec. But the point is to make sure upper manufacturer A's part fits to manufacturer B's barrel nut, and to C's lower. Its a standard, fitting is the builders job.
Yep, generally, see Eli Whitney. It is simply a set of specifications, not better, not worse, just is.
That is why I have to laugh when liberals use the phrase milspec AR-15 as if that means it is a full auto death machine. Got into that with my father once. He said something to the effect of "why would anyone need a milspec AR-15 assault rifle?" I asked him to explain what that was and of course he could not. I then reminded him that the then new Ford F-150 had a "milspec" aluminum body but it wasn't a freakin' tank.
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