I recently purchased this pistol from Krale. It's advertised there as a 7.5J pistol. As far as I can see there is the MP-651K which is 7.5J and the MP-651KC which is 3J. Mine is clearly marked with MP-651K on it but I am definitely not getting more than 3J for sure.
Gamo 8.18gr .177 lead ball - 350-360fps - ~3.2J
JSB Monster 13.43gr .177 - 260 fps - 2.75J
Now I didn't really expect a full 7.5J off CO2 as that would be 550fps for the Gamo lead balls out of a pistol, but I would've like to see ~450fps for the lead balls based on the energy claims. It's a fun little pistol but I'd like to see if there's a way to bump the power a bit.
Gamo 8.18gr .177 lead ball - 350-360fps - ~3.2J
JSB Monster 13.43gr .177 - 260 fps - 2.75J
Now I didn't really expect a full 7.5J off CO2 as that would be 550fps for the Gamo lead balls out of a pistol, but I would've like to see ~450fps for the lead balls based on the energy claims. It's a fun little pistol but I'd like to see if there's a way to bump the power a bit.