HDR50 TR50 V2 15J - 30J Power Kit (For 7.5 Joules Model) BT Iron Horse This is how the barrel

This is how the barrel works: the inside of the Tactical Rifled Barrel (the bore) consists of many fine cuts that extend for the full length of the barrel

and Pro Custom

MIL-STD 1913 rails

1 x Shim kit

It easily attaches to a standard Picatinny rail and offers convenient windage and elevation adjustment

HDR50 TR50 V2 15J - 30J Power Kit (For 7.5 Joules Model) BT Iron Horse This is how the barrelThis power kit increases the output of the TR50 HDR50 to 15 to 30 Joules. It works on 7J. The final power output depends on the type of air and ammo used. Made in Germany NOTE: Installing this kit on your airgun will void the factory warranty. Due to the nature of this upgrade and the technical expertise required for installation, we do not provide installation support. Compatible To These T4E Models: T4E TR 50 Revolver