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1-year limited warranty
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Things I liked: Much improved accuracy, by taking away the recoil characteristics of a metal spring. Able to keep NP powered rifle cocked for extended period of time without possible damage or fatigue of piston. Good power, although possible loss of fps with conversion, but very little at that.
Things I would have changed: The Nitro Piston is not a bad piece of kit. I would like to see if Pyramydair will offer the Hatsan Vortex in the near future. There is really nothing I can think of at the top of my head on what needs changing.
What others should know: I had this installed in my Hatsan 125Th, in .177, and it is like shooting an entirely new beast. The shooting of my rifle took much practice and a consistent hold when the metal spring was installed, but with the NP hold placement is much less sensitive. Accuracy is very much improved.
Things I liked: I replaced the springer in my Walther Falcon Hunter and what a difference it makes. Easer to shoot and more accurate even with open sites. Pyramyd Air made it very easy to get it installed and returned to me. Thank you Pyramyd Air for your great service and technicians.
Things I would have changed: Make them for more air guns.
Things I liked: Nothing! I bought a WFH 22 cal that had this upgrade done to it by PA. These guns are supposed to shoot in the 900 fps range with 14.3 pellets. Mine shoots 750 fps way too slow. This is what my Trail NP shoots and it probably had the same piston installed intop the WFH. Not what it should be. Don't do it.
What others should know: Find some of the new NPistons... by Moller and N Forcer have one of those put in.
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Will this fit in my hatsan torpedo105x springer?
I have hatsan mod125 with original vortex gaspiston, but the vortex gaspiston is broken. Can This piston fit in my hatsan mod125 or only fit in a springs hatsan mod125?
Will this fit the Webley Patriot (Turkish)?
I would say it's very possible. I doubt it would be a simple drop-in deal but I'd imagine any mods needed would be fairly easy. I'm pretty sure this is a Trail XL spring with those plastic caps at each end to fit the 125, and the XL springs dimensions are: 300mm oal. Body 169 x 18mm. Shaft ~131mm x 8mm. So better than no info... If you or anyone buys this conversion nitro please post it's dimensions with and w/o caps because lots of people could use the info. Also, there used to be a gas spring conversion just for the Patriot ~7 years ago. They were kinda rare guns so they probably sold very few springs and no doubt stopped mfg, but maybe you can find some info like dimensions online?