Walther Reign bullpup regulated ?

[Jorgen]

I have the mk1 in .22 and shoot with a Huma external regulator for a consistent 925 fps. My friends on the range tell me it’s as accurate as an FX impact and manage 10mm groups on 50 meters with the Walther. I need a bit more practice for those results

 

[tradecraft4f]

I had to increase HS to get any power out of my Walther Reign .22 , I'm at 37fpe with NSA 17.5gr I only fill to 2,700psi. Pointless to fill any higher. The HS is to light still. A regulator would be awesome.

I had to increase HS to get any power out of my Walther Reign .22 , I'm at 37fpe with NSA 17.5gr I only fill to 2,700psi. Pointless to fill any higher. The HS is to light still. A regulator would be awesome.

How hard is it to increase hammer spring in the Reign?