[JDoorn]

I'm having a weird problem with my 416. It has a 2 piece hop up.

When I snug the barrel nut up all the way the gun does not shoot, the bb's just fill up the inner barrel, and then roll out. If I loosen the barrel nut one half turn the gun shoots great but the barrel is then noticably loose...

when the barrel nut is off and the inner is in the outer and the outer barrel is in the upper reciever there is an allen key set screw that that puts pressure on the hop up unit where the barrel enters it, I'm guessing to keep it in place... Do I just need to find the "sweet spot" for where I should secure the hop unit? I played with it for quite a while and the only way I can get it to fire is with the barrel nut slightly loosened.

Any help/tips are, as always, greatly appreciated.