Just love how this power mod turned out and like to share the info:
This one has a long forearm stock with Huggett shroud. 28.75" OAL. standard length air tube.

OEM hammer spring was only limited to 840fps, without adjusting the reg pressure and only installing the brass / spring guide weight made all the difference.

got little more air volume by milling the spacer inside the regulated air chamber.

Spec:
fill pressure 250 -150b
#shots 23
High 895
Low 888
Kings MK2 33.9g
accuracy at 50Y less then 1/2"
This one has a long forearm stock with Huggett shroud. 28.75" OAL. standard length air tube.

OEM hammer spring was only limited to 840fps, without adjusting the reg pressure and only installing the brass / spring guide weight made all the difference.

got little more air volume by milling the spacer inside the regulated air chamber.

Spec:
fill pressure 250 -150b
#shots 23
High 895
Low 888
Kings MK2 33.9g
accuracy at 50Y less then 1/2"