The set consists of a stainless steel grooved cylinder, the grooves on the cylinder are for better cooling when shooting. Aluminum cylinder head with two O-rings for better sealing, the head can be used in combination with a silent piston head. A 21.37 mm long nozzle with one seal, which needs to be lightly lubricated before installation for better nozzle operation on the cylinder head. And a polymer sector gear clip/delayer for proper bullet feeding function when firing.
