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To sum it up, synthetic heads absorb more impact and provide more gearbox durability. Metal ones are harsher on the gearbox but provide a slightly louder sound on each shot.
No need to worry about the durability of the piston head itself. It's extremely rare to see a piston head break.
Read the link that thephenom provided to see more details as well as some specialty piston head options such as hard recoil and silent head sets.
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