There’s nothing worse then starting to loose FPS without a reason. Just in time for my warranty to lapse. Damn it Gamo….
So I built my own press to disassemble the gamo air rifle. The gas spring doesn’t need that much room but you need a press to install and remove.
After I got the whole thing taken apart and I found some of the worse damage I’ve ever seen on a plunger.
The Press isn’t hard to make. Just need some wood and some time. I used a 1/2 inch bolt to press the gas piston to uninstall and install. On the Bone Collector model you must remove the reset wire on the trigger group before going too far.