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Old May 16th, 2011, 22:30   #8
HKGhost
 
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Join Date: Nov 2009
Location: Mississauga, ON
Do you know what FPS you're shooting at? If replacing all the parts you've listed and still having the same problem, it may be caused with a drop in fps. I think you should open up the upper and check the piston head and it's seal.
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