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FPS drop on my l96?

6469 Views 16 Replies 5 Participants Last post by  SilentScope
I have a heavily upgraded utg l96, sears and metal triggerbox, a angel custom piston and piston head, a prommy 6.03 barrel, pdi hop up, scs nub, systema bucking, and the spring and spring guide from the utg upgrade kit, I recently put in the piston and piston head, and now I'm noticing an fps drop, it should be shooting 550 with .2, and with .4s I was able to go through almost 4 cans on a poor mans chrono. I just did a poor mans chrono after having the piston and piston head in for about 2 weeks, and I go through 1 can and dent the second, thats a major drop, and I don't know why? Is it the piston head? I have to be losing air somewhere, my best head is the piston head because I was reading recently that it can change shape with use and cause a bad air seal, but thats only a guess, it still looks normal shape to me but I'm not sure.
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Leavint it compressed doesn't always do it. LEave the spring to rest for a day or two while and then re-test.

My El-chepo metal piston gives my gun an extra 50fps meanwhile my PDI one takes away about 50! But it's more consistant then the other one!
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