This barrel kit has extreme tolerance to increase the output of the HDP50 to 30 to 40 Joules when combined together with the power kit. Without the power kit you will get 20-30 Joules. The barrel kit comes in 2 parts, the barrel with a thread protector and the 4 inches barrel extension. Add on the barrel extension increases 3 to 5 Joules.
The final power output is depending on the type of air and ammo used.
Made in Germany
NOTE: By installing this barrel to your HDP, your factory warranty on your HDP will be voided.