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The carrier bolt on the picture was used for gas pressure tests
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But the bolt head front section as a larger diameter then the diameter on a case,did it used a diferent barrel and chamber?
As the bolt head as a section in front of the locking lugs,could it strip a case out of a magazine?
As it cant use a case to be fired,does it use some apparatus connected to the barrel muzzle in order to vent in pressurized gas to operate the bolt gas system,how did it worked?