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
![[Army Force] CNC Full Steel 19 Teeth Piston for R85/SR25 Series](http://www.sixmm.com/cdn/shop/products/ArmyForce_CNCFullSteel19TeethPistonforR85SR25Series.jpg?v=1609156558&width=950)