POM aluminium cylinder head and aluminum piston head on a V2 gearbox

[Whambham]

Hi quick question

on a G&G Top tech M4 with a V2 gearbox will a POM aluminium cylinder head it has a rubber cushion and aluminum piston head no cuchion on a V2 gearbox will this break the gear box the pistion has the first 3 teeth steel rest is made of poly and the spring is a madbull m100 it also has an aluminium air nozzel