How to install the Powerkit 50 in Umarex HDR50 

Check out www.homedefence-24.com
DONT buy tuning parts from Ebay because they are a fraud!
A big thanks to Florian Søllner for sending me the parts :)
In this video I show you how to install the tuning parts in your 7,5 joule version of Umarex HDR50. Its an easy job even for my bad artritic fingers. It only takes ca 30 minuts work from start to finish :)