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The stock Modify oring is too small. Go to home depot, get a 1/4 inch oring and replace the one you have right now. Also, replace the hop up rubber with another one to see if the compression issues (if any) are coming from the hop up. If that doesn't work, your spring may just be weak; get a Modify M110 spring and u should be shooting 390ish fps. U might as well get a Modify portless cylinder while you're at it. My P90 uses 85% of the same parts as yours, there's no reason why it shouldn't be shooting 370+ fps.
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- Certified level 43 Autosniper by Commander Amos
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