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Old 10-17-2012, 06:23 PM   #3 (permalink)
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Join Date: Jul 2006
Location: Pittsburgh, PA

Would it seal better? Of course.

However, the o-ring would add drag to the bolt, countering the efficiency gains.

Also, there isn't enough material in the bolt in that area to add an o-ring groove. It would require a new bolt design. You would have to decrease the flow path of the gas to gain enough space for an o-ring. That would also lower efficiency.

Additionally, the gas when leaving the bolt is being directed forwards. It has to turn 180 to escape between the bolt and barrel. So not much is escaping via this path.

Plenty of other markers lack an o-ring on the bolt tip. It isn't a critical component.
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