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It seems you might need a new cylinder! I'm not sure if kwa m4's come with non-ported cylinders, but I don't think they do. A barrel as long as the 509mm needs a non-ported cylinder because with a ported cylinder, more air can escape therefore making the piston head hit the cylinder head after the bb hits leaves the tip of the barrel, which causes lack of compression (fps/accuracy degrades). If you already have a non ported cylinder in your m4, my second best guess would be getting a new hop up bucking, it could have ripped, or lost elasticity during the inner barrel swap!
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