KA SIG 556 HOLO Parts

[LazzurusMan]

So after nearly a year away from the game I've finally decided to try and finally get my sig back up to working order.

I've upgraded to a high torque motor, new piston and piston head and am running 11.1 lipos. Unfortunately I'm down to 180 fps, and think I'm losing compression in either the nozzle or hop up.
Does anyone know where I can find genuine KA SIG 556 parts? It has a horrible extra long nozzle and I believe a unique hop up chamber, so I can't find any usable aftermarket parts.

Any help would be appreciated as I loved this gun to bits when she was firing fine at 22rps and 350fps.