
Originally Posted by
Proteus
what causes a barrel to be over gassed? too big of a port?
whats the problem with being over gassed?
accuracy? excessive wear and tear on the bolt or extractor?
If it is over gassed it will wear out faster and have a sharper recoil impulse(I speak from experience in regards to the recoil, though not a lot you can pick up the sharper force). Also, if the barrel starts out over gassed as you shoot it wear will expand the size of the gas port over thousands of rounds that could result in even more issues up to and including the rifle being able to reliably function over the course of its life as the port expands to where it is throwing so much gas the the carrier is out running the ability of the mag to feed rounds.
Punching paper it isn't an issue, but if you plan on betting your ass and balls on the rifle working when you need it, proper materials and port size makes a lot of difference.
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