We do not see any reason why you should use a “metallic” piston head. The stock piston head is good at absorbing much of the impact generated by the spring on the mechbox shell. You should not need to replace the piston head unless the stock one breaks or that a bore-up cylinder is to be used. The replacement piston head does not have to be a metallic one though.
A silent head set has a bumper-rubber installed in both the cylinder head and piston head. While it can reduce noise a little bit, beware that noise also come from the other parts of the mechbox and also from the motor. You need custom works on the gun to achieve total noise reduction. The Japanese are very good at doing this, but the cost is very high.
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