First tip, don't fully upgrade it. Replacing parts that work well together with a hodge poge of random parts of varying specs and quality is asking for trouble. If your cylinder, cylinder head and piston head give you a perfect seal together do not replace them. Also, a metal rack on the piston is a mixed bag. Yes, its tougher, but if sonething goes wrong, your gears are likely to get damaged. Pistons are cheap, good gears are not.
Keep quiet. Sound travels faster than BBs.
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