I have a question about the gas efficiency of my mag. I bought it from my brother a while ago, and it has a lvl 10 and a retro valve with I think a reactive trigger. I have a 68/3000 PMI hp tank, and I am getting about 3 1/2 to 4 hoppers (halo b) from one fill. Is this average? or below? to me it seemed like that wasnt as much as I should be getting. Any help would be appreciated

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