[JDoorn]

I'm assuming no one has come across this system before. I'll try to give more info.

The gun is an AGM 614. It has a 2 piece hop up with a 290ish mm inner barrel. Like I said previously, there is an Allen key set screw threaded into the outer barrel from the top that then gets covered by the barrel nut, this set screw then puts pressure on the hop up right where the inner barrel enters the hop up. Tightening this screw secures the inner barrel inside the outer barrel, and keeps the hop up, I'm guessing where you want it. If you do not tighten this screw, the upper receiver does not slide all the way on the lower..
This is all the info I can think of to give... Please help...
Thank you