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sounds like its more than one thing.... The inconsistent Fps could be from too much lube in the cylinder or hop-up. Also try using a different hop-up bucking and piston head. Like stalker said, there... well....crap!
Also stretching out the o-ring on the piston head helps, sometimes they come a little small and can leak at high pressures.
Try putting the stock o-ring back, guaranteed you will have an fps increase just by doing that.
200 fps is low for a m100 spring, so i dont think its just one issue
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