What type of magazine were you using, and what happened to it when the blowout happened?
The one overpressure kaboom I've seen (at the Ft Lewis shoothouse during a blankfire run) involved an M16A2, blanks, and a GI mag. It blew off then end of the extractor claw (I was a safety, up top the catwalk, and a sizable fireball came out the ejector port) and blew out the bottom of the magazine.
It would seem to me that that route would offer considerably less resistance than through the sidewall of the upper receiver.
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"Of all tyrannies, a tyranny exercised for the good of its victims may be
the most oppressive. It may be better to live under robber barons than under
omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep,
his cupidity may at some point be satiated; but those who torment us for our
own good will torment us without end, for they do so with the approval of
their own conscience." -C.S. Lewis
Happiness is a belt fed weapon. -unknown
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