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Update to my vortex fix. I just pulled out the Mod 87 after a couple months of sitting, and the piston was empty again. I filled and put more Pel-gun oil it. We'll have to see how long that lasts. At 150bar fill, it was shooting 9.57gn Hunter Extremes at 955fps. Giving over 19fpe.

My fill probe connects to a 1/8 " foster quick connect. It has a steal tube about 1/4" in diameter with an "0" ring at the tip and one at the back. You push the first "0" ring into the port on the Vortex piston, then put pellgun oil in so it fills the space between the "0" rings. Then press the...

I have two Hatsans with vortex pistons. Both failed after very few shots. Both outside of warranty. I found a $7.00 adapter to fit a high pressure pump and fixed both guns by recharging the piston. I added a few drops of pellgun oil when I put the air in. I charged both above 140 bar.