I had to take apart as wasn’t working to find the slider had snapped along with plastic on wheel to had split , thankfully I had these from old gearbox and was able to get firing as gears are good,was going to complain but left too long before I tested
![[Systema] Hop Up Adjuster, Roller Packing, Fit-pin for Roller Packing [for Systema PTW]](http://www.sixmm.com/cdn/shop/products/Systema_HopUpAdjuster_RollerPacking_Fit-pinforRollerPacking_forSystemaPTW.gif?v=1644237281&width=950)