Installing a Greyguns SRT into an HK P30SK. Removed the hammer spring catch--NOT typical HK P30 type. Must be due to the abbreviated grip.
Catch has a round solid piece with a rectangular hole for the hammer spring guide. Then a very small spring and a BB size sphere. Need some guidance on how this spring and BB are oriented to allow the hammer spring guide to move. Have to love HK and German engineering.

Give Grayguns a call or send them an email note, they always will help you.

If greyguns doesn’t help you go to a HK forum, mucho help there too.

PB