The piston broke because your gun jammed.
If you continue shooting on a jammed gun, it's a downright guarantee you'll break the piston.
It's absolutely retarded to make a piston out of cast aluminum, it has very little elastic give to it, and simply cracks and breaks when stressed. Polycarbonate however has much more elasticity and is much more resistant to the stresses a piston is exposed to.
So buy a polycarbonate piston and use a 9.6v battery
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