This barrel kit has extreme tolerance (12.7mm/.5inch bore) to increase the output of the TR50/HDR50 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
Installation Help: How to install the Powerkit 50 in Umarex HDR50
GUN NOT INCLUDED
Dear All. Unfortunatelly this item is restricted in my country. I haven't been aware of it. Sent my money back, please. I very apologize for turmoil. Best regards. Jerzy Slazak
HDR barrel upgrade
Massive Power increase shoots through tin cans with hard rubber balls