Right, temperature variation which causes a change in pressure, affecting fps...how hot does this thing usually shoot? Does it feel like a gas hog? Is it possible there is a poor seal between the hop up rubber and the nozzle?
as an anecdote I switched my ghk nozzle to an aluminum prowin one with a stiffer hop up rubber and the thing would not fire full auto with green gas... it literally just blew the gas out the side till I either used co2, or put the softer rubber back in...
just thinking out loud here...
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