As Styrak said, leave piston stock, although KWA tends to use pot metal for it's internals, the piston/piston head tend to be durable. If you feel you need a new piston, first do an air compression test seen YouTube - ‪Amos Airsoft how to: AEG Compression test‬‏ done by Amos, one of ASC's favourite gun docs. Although if you need a piston, Deepfire has some of the best from what I've heard
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