This kit doesn’t have a steel weight replaced by a black delrin spring guide with a steel 52mm 1.35 wire spring and a stainless 50mm 1.25 wire size spring to get lower speed and more air efficient. Come with hammer with a delrin bumper press on at the front if u have a C1 with delrin bumper u have to cut off the bumper or just use your own hammer. If u want to shoot low power using lower regulator pressure this kit will work. Without the steel weight the gun is slightly quieter in terms of mechanical noise.

This kit reduces the need to turn in the valve adjuster to lower speed that increases the noise when hammer hitting the C1. So adjusting speed u will be using the power wheel and micro adjuster.