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What are you using this for? I use propane with an AI propane adapter and I can shoot 360fps with 0.20's with a stock gun on a hot day, above 400fps on a really hot day, usually around 320-340fps on a warm day. I've never heard of people using red gas outside of Asia so I really have no idea what its like but if I can get these muzzle velocities with propane (same PSI as green gas I think) then I wouldnt want to use anything more powerful for safety reasons.
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