I’ve had many Hatsan’s over the past decade plus. Like to tinker and tune them. They are a good gun with with loads of potential. German steel and Turkish Walnut. British engineering. Made in Turkey. I have however, had every Vortex gas ram fail less one. I have been in contact with Hatsan waiting for them to get in spring conversion kits for the the 95 & 135. Finally they did. I just finished converting the last of four from rams to springs. Lined the piston with thick blister pack (soda bottle) plastic and polished the internals. No difference in the cocking or firing cycle. No twang or vibration. Really solid. And no more dealing with tired o-rings. No PCP’s anymore either. Just springers and pumpers. O-rings in pumpers last for decades because they are not under any stress when at rest. No 3000 lbs of pressure. Simple is the way to go for me. These four are the ones converted. If you have been considering the same, now is the time. At least acquire the conversion kit while they have them. $39.95. Spring, spring guide, washers and receiver end cap. 
