A complete cylinder set for the ASW338LM airsoft sniper rifle (Ref. 17138), it consist of a stainless steel cylinder, stainless steel cylinder head, piston, M170 spring and spring-guide, all assembled, ready as a drop-in installation. With this upgrade the ASW338LM will have a muzzle velocity around 170 m/s or 557 fps.
IMPORTANT when upgrading to this cylinder set, the zero trigger assembly (Ref. 17219) must be installed as well.