PPS brand brings a simple, but affordable upgrade kit for Well L96 MB01, MB04, MB05, MB06, MB08, MB14 and Snow Wolf M24, M99. This set after installation increases the performance of weapon to 500-550 FPS (150-170 m / s). In the box you will find aluminum piston, spring guide with bearings and spring. If you have a plastic trigger mechanism we recommend a replacement for metal trigger mechanism.