Further Tuning on an Umarex HDS.68 Home Defense Shotgun.
Tuning an Umarex HDS.68 So you have already removed the restriction in the gas chamber, fitted the Powerkit68 and removed the brass top hat that sits in front of the brass gas tube. And you want more power? Well my example of the gun was coming in very under powered before the mods and, although a massive improvement after, I still wasn't getting the power that some other people have been getting. I didn't film this work but I did take pictures throughout the procedure. Hopefully this will be just as good an information source as one of my videos. I'm assuming you have already taken the gun apart before so you will know how to do that. The internal mechanism will have to be stripped down. We are going to remove the barrel assembly from the gun which is quite straight forward, just make a note of where everything goes. It is a good idea to take pictures at this point to remind yourself of how it goes back together. Remove the screw from the barrel catch and you should now