ive left the firing kit alone , just removed the plugs that would have paired it to the old rx18 , with a pair of micro switches operated with a micro servo and operated through one of the standard stick channels , one half will operated the firing motor the other will make the barrel lift , ive heard the original smoker is proverbially crud , its currently wired with an isolator switch , when it gives up we will look at changing it for somthing better . jon