Lightweight very durable nozzle with o-ring made from acetal (thermoplastic polymer material used in precision parts that require high stiffness, low friction and excellent dimensional stability) is great to achieve better tightness than with standard nozzle without o-ring. It have 21,4 mm long
Piston with all metal teeth. Model with holes to lighten the piston, raising the firing speed without changing the spring of the weapon, without great compromise in the durability of the piston at medium powers.