Bob,
The magwell conversions in general are hit and misses for G36s.
But your problem sounded like mine, where the feed nozzle did not match the position of the hop up chamber (you can probably see the lip of the hop up chamber sticking out when looking down the feed nozzle)
The hop up chamber on a JG shouldn't be touching the gearbox, whereas all the other G36 brands do touch.
The magwell conversions in general are hit and misses for G36s.
But your problem sounded like mine, where the feed nozzle did not match the position of the hop up chamber (you can probably see the lip of the hop up chamber sticking out when looking down the feed nozzle)
The hop up chamber on a JG shouldn't be touching the gearbox, whereas all the other G36 brands do touch.