Really low power Kral, troubleshooting

[freddich]

Hey guys! First post on here.

Im kind of semi-new to airguns and this is my first pcp. Anyway, The stated power output for my .22 kral puncher mega is somewhere around 50J, but when I shoot it it feels way less powerful than most of my springers. Unfortunately Amazon decided to send me something completely different than what I actually ordered, so I won't have a chronograph until next week. But to get an idea of the power: when I shoot it at a plank of wood (regular 1x4) with a regular 18.13  grain lead pellet, it goes in like 4-5mm and then bounces back, not really deformed at all.

Parts inside the rifle may be different, as it was purchased in Sweden (10J limit), I just received my firearms license and will therefore be modifying it back to stock. I was told by the seller that the only difference from FAC was that they blocked the power adjuster, so I removed that, no huge difference really.

 If anyone has any idea what could be up with this thing, or have one that shoots well that I can compare it to, I'd love some help! Thanks in advance!