That's a little bit of a miss conception on that article. The HK416 was fired with a suppressor. I don't know if you have fired a suppressed weapon but I have and any excess gas trap in the suppressor goes back into the action. I fired a HK MP5SD and the smell from the gas coming back into the receiver was burning my eyes. If you fire a M4 with a suppressor the excess gas and noise escapes though the two gas ports in the carrier. Also it could also be that the PMC and the XM193 that he used was not the ammo recommended by AAC for use with the suppressor.
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