Russian 242 lbs / 220 bar Hatsan piston

[Zifnub]

I came across these pistons when looking for Hatsan on ebay.
You can find them if you search for "Gas-Spring-GigaPower-VD-for-HATSAN"
They seem to have a store as well at airgunstore.ru , but I cant read Russian.

Anyone who's got any experience with these? It seems like a really big power increase compared to the default piston, but I wonder if it's worth risking damage & increased wear to your rifle.

[Rob M]

https://www.ebay.com/itm/162980455410?rmvSB=true

LINK

[Rob M]

LOOKS PRETTY SWEET, but I recall a conversation with an expert saying there is veery little togain from just piston force, and that it needed to be combined with additional swept volume in order to gain substantial power..

[Zifnub]

Swept volume would be the volume inside of the piston right? So your piston would need to be thicker/longer.
Would the behavior be the same when using heavier ammo though, a heavier projectile would give more resistance and the force of the piston would come into play more?

[Rob M]

Swept volume would be the volume inside of the piston right? So your piston would need to be thicker/longer.
Would the behavior be the same when using heavier ammo though, a heavier projectile would give more resistance and the force of the piston would come into play more?

there would still be a gain in power, yes.. and I bet the heavier pellets would show that more than the light ones.. should be very interesting I'm surprised more guys with the 135 QE 30 caliber have not chimed in

[dan_house]

piston has to be shorter, or you give up volume and reduce power, negating the power increase the gas ram _can_ produce.

Preload can factor into it. Also the transfer port....

remember ALL airguns are systems, and changing one component can affect the rest of the system. Adding more power means the sear has to hold that energy and likely to affect trigger pull wieght and how that trigger feels....

AND IMO adding power is a fast track to making a gun inaccurate....

[Rob M]

piston has to be shorter, or you give up volume and reduce power, negating the power increase the gas ram _can_ produce.

Preload can factor into it. Also the transfer port....

remember ALL airguns are systems, and changing one component can affect the rest of the system. Adding more power means the sear has to hold that energy and likely to affect trigger pull wieght and how that trigger feels....

AND IMO adding power is a fast track to making a gun inaccurate....

I think its worth a go for heavier rounds like 135 25 cal and 30 cal.. nothing to lose I guess.

[dan_house]

yes start with the heavier pellets.