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Old 11-06-2012, 11:07 PM   #4 (permalink)
Stock Class Aficionado
idkfa's Avatar
Join Date: Mar 2007
Location: Vancouver, BC, Canada

Am I correct in saying that you tried a bulk CO2 tank and a HPA tank when experiencing the FPS drop? You mention stock class but didn't specify that you were using 12 grams for your test.

If you are using a bulk tank, check that your pin valve isn't being choked off. If using 12 grams, follow cobyrne's advice above.

I can't imagine ambient temperature causing that severe of a drop. I have used a 3.5 oz tank in -10C and only dropped to 250 fps or so before adjusting my springs.
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