Kwa nozzle and hop up
 

Has any one successfully gotten a standard shs nozzle to work with he Kwa two piece hop up?

I'm getting an air leak between my stock cylinder head and nozzle and want to replace them both. I've already replaced cylinder, piston and piston head but the cyl head, nozzle and hop are all proprietary and need to work together.

I tried to just change the nozzle but got terrible fps drop.

Nothing wrong with the stock hop so I don't really want to mill out the receiver to take a one piece hop up unit but I'm kinda stuck at this point.

Any help would be appreciated.
Thanks!