Finally I have it where I want it.
SRS A1 covert,
Random foam filled suppressor,
Rapax 2J with 1x spacer - 334+-2 fps on Geoffs .43s,
Faceless barrel 420mm, 60deg r hop patch and 100% airseal bucking with a FAST hop (perfect air seal)
Wasp piston with medium weight and full break and...