after doing some shooting to-day all seems good .
no problem now with leaking gas i changed the o ring seal /sticking charger, just needed silicon oiling,
all working good so a happy shooter, thanks all for the help.
will do ,mod done on leaking mag new seal installed don't think it is leaking now,
other seal was torn not split but a bit hanging off, so replaced it with seals i had.
gun cycles ok, it fires ok but it stops with bbs in the mag, it fires 3/4/5/then stops gas still in mag, also some times you have to recharge because it does not recharge with the blow back what can i do to stop this?