I bought a KOMBI | Valve Powerkit.68 + FIRING BOLT inkl. PIN | HDR68 | 30J+
AND, with my hdr68, I only got 20 joules...
AND even by removing the reducer above the CO² capsule and I had 21.4 joules with rubber ball on the first shoot (with a new c02 cartridge) and 23 joules with the devastator (with an adjusted caliber) with the first shoot (with new c02 cartridge).
So, unfortunately it is far form 30 joules ...
Moreover, by removing the reducer above the CO² capsule there is less power for the next shoots. So the first shoot is the most powerful and after you get a decrease...
I am disappointed.