You SHOULD have an anti-siphon you dont NEED one. I should know i have run many off of normal co2 tanks. And Impulse do not suck air as long as you have them set-up right. This is based on your dwell and your input pressure. My friend will get an easy 1700 shots off of a 68 smart parts co2 tank(28ounce i think). That is good efficiency.
Again it's a great gun!!!
Again it's a great gun!!!

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