WarBear Ventilation Piston Head


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WarBear Ventilation Piston Head 
Essential part for upgrading your Gearbox 
The ventilation holes on the piston head can greatly increase the speed that the piston travel; thus it increases the speed that the gun fires 
The piston head has a special design which can decrease the friction occurs when the spring compresses 
This design not only can prevent the malfunction of the spring, but also increase the durability.