Why limit yourself to just commercial stocks? Off the top of my head, SOPMOD's and the Troy Battle axe stock are mil-spec only. I know there are others. Meanwhile, literally every stock worth owning has a mil-spec version.
"Real" mil-spec tubes are built from hammer forged 7075-T6 aluminum. You can buy mil-spec dimension tubes on Ebay for like $10 but they are junk and not built to proper mil-spec. Commercial tubes meanwhile are made using 6061 aluminum alloy and have higher failure rates.
Read this thread for various pieces of info on RE's:
http://m4carbine.net/showthread.php?t=101
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