(Continued from Part 1. This concludes the article.) The mid-length and rifle length gas systems are known for operating the action more smoothly when compared to the carbine length system. The mid length gas system increases for the carbine length barrel. The longer gas tube gives a longer bolt carrier dwell time in the rifle, which lets all the moving pieces work a little more slowly and less violently but still quickly and energetically enough to let the bolt carrier move back fully and allow the bolt to strip the next round off of the magazine reliably. The entire recoil …
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