so, which is more difficult? Converting to coil spring or replacing gas piston o-rings? My handtools consists of wrenches, screwdrivers, hand drill, hammer, circular saw and I don't have an air pump. I just bought a new gas piston for my .25 135 and its now pushing ftt's at 590fps with that brand new gas piston. I also bought a new gas piston for my .25 Edge and its pushing the same pellets at 550fps with its new gas piston. So, obviously the brand new, straight from HATSANUSA gas piston isn't at full power and I can't fix it. I don't even have the time and energy to try to send it back to them.
The beautiful thing about resealing the 135 gas spring is that, if you have the means to precharge the spring, you can rebuild without a spring compressor.The gun can be reassembled and charged after assembly.
i believe the 135 has the same Type 2 gas spring as the Mod. 95.At least it has the same breech block end on the Vortex.I think that the parts to convert the 95 to spring are available.It is possible that the 135 has a longer stroke than the 95...can't remember...If so, it would require a longer spring and spring guide.Check this out: https://hatsanairgunsusa.com/wp-content/uploads/2018/12/Mod135QE-Exploded_View-April2015.pdfDo you have a spring compressor??Ronno, I'm pretty sure that, by now (3/22), you know the 95 Vortex has a "Type 1" gas spring...Right? Just sayin' I have resealed several Hatsan Vortex springs. I just did a Mod. 135.The O-rings that I have replaced in every Vortex gas spring were brittle and crumbled when I removed them.I replace w/new 90 durometer O-rings that should last for years, especially if stored muzzle down so that the silicone oil pools at the rod gland.Just my $.02........