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GI_Tye wrote:Could some one please tell me the difference between Negative Pressure and Positive Pressure? Why does it need to be changed? Is there a preformance difference? I think my G&P M7A1 is a WOC-X. Is there a way I can tell if it is Negative Pressure or Positive Pressure? Thanks in advance.
GI_Tye wrote:Can you tell by looks what the gun has?
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