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Thank you for sharing the video link - the replacement appears to be straightforward, but I don't know if the math will make sense. I paid $180 for this in 2017 and it looks like the piston will run ~ $100 (I'm not sure what the part number is, but the cheapest non-refurbed one on Hatsan's site...

There is not as much resistance when I cock it. I have been searching for a how-to video on replacing the piston, but haven't been able to find one that would walk me through the replacement. I would prefer not to have to send it to Hatsan for repair. Is the replacement complicated?

I purchased a Hatsan 87 Vortex QE from Pyramid in 2017. I have probably fired about 50 rounds since that time. I went to use it this week after not using it for several months and it would not fire. When the spring releases, I can feel the pressure, but it "rattles" a few times without...