I haven't bought a complete off-the-shelf AR in years* but most of the BCGs I get are well staked. However that doesn't mean I don't check the gas key bolts and give it another little nug with the MOACKS just for good measure.
* If the M&P15 ever comes with a 1:7 twist barrel and M4 extensions I'll buy one, as is, right off the shelf.
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