Yes, the GK1 has adjustable power. There is a screw that is accessed through the grip that allows you to increase or decrease the velocity. This controls the time the valve is open, if you turn counterclockwise, the power will increase, if you do it clockwise, it will decrease. As there is no regulator, this is the only adjustable power feature. Being unregulated, the gun’s power will also depend on the total fill pressure. The more pressure, the more power. As you shoot the power tends to decrease, but the descent is gradual. The valve compensates for the drop in total pressure by staying open longer, meaning that the GK1 is more consistent than your average unregulated PCP. However, notice that for this reason, you should always “match” the power regime with the total fill pressure. This means that you can’t let the fill pressure drop down too much (no less than 150-160 BAR), as the gun might experience issues at this point, because the valve stays open too long and might malfunction, dumping all the air. With heavier ammunition, increase the pressure limit where you should refill it (e.g. make it 180 BAR).