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4/9/2016 9:45:14 AM EDT
i was looking at aero uppers and they said m4-m16 spec is that the same as mil spec?prob dumb question but i wanna be sure.
4/9/2016 10:11:14 AM EDT
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Quoted:
i was looking at aero uppers and they said m4-m16 spec is that the same as mil spec?prob dumb question but i wanna be sure.
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It's just marketing spec, but that's probably what they intend it to mean.

The actual milspec specifies that rifle ("M16") upper receivers do not have feedramp cuts, while carbine ("M4") upper receivers do have the feedramp cuts.  It's thus not possible for any upper receiver to meet both the M16 and M4 milspecs.
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