I think its the hop up system, sometimes these hop up system don't align well with the barrel and the nozzle. Its kinda tight when it hits the rubber bucking that's why you're loosing alot of FPS. That happened to me when I installed a new hop up system on my p90 and my friend installed a new hop up system on his G&G m4. I mean your soft bucking should be fine. Try aligning it well and make sure the nozzle doesn't hit a snag onto the bucking. Madbull hop up unit doesn't work well on G&G m4's. I agree with styrak, don't use a ported cylinder on a short barrel.
Last edited by cjboi; July 22nd, 2010 at 05:58..
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