Diana Winchester 353/Diana 5

Piston and seals are available from JG Airguns for the Diana 5. You can have the exact parts needed.

 
so, the answer is NO i got an early model 5 with the full grip frame maybe 10+ years ago and i had to get a piston out of Germany to fix mine as it was missing
now if it is a 5G the you would have a better chance
so the model 5 - model 5G - model 5G mag or lp5 all take a different piston
now this is Waffencenter Gotha in Germany the pistons will be listed 5 first, 5G next, and 5G mag
https://www.waffencenter-gotha.de/s...t-mit-Luftkolbenmanschette-DIANA-5::1881.html

https://www.waffencenter-gotha.de/s...-mit-Luftkolbenmanschette-DIANA-5G::1882.html

https://www.waffencenter-gotha.de/s...olben-mit-Dichtung-DIANA-P5-Magnum::7542.html

you will see that Waffencenter is have the early model reproduced and that is something that they do
front seals are the same
it helps for info but not your repair
to get a piston out of Germany would be about 100 euros or say 110.00
 
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most of the time the pistol gets shot and shot after the seal had failed and pounded the area to mount the seal to death
yes i see the prices which in my opinion are way out of line but that is today's market
they are easy to work on but at the same time a pain in the backside
there is a trick
the rear cap that screws into the tube is a m3 now the problem is how the hell do you unscrew the cap and hold the spring
well you use the m3 screw in the tube to hold the rear tube filler and then switch to a clamp or push hard against a strong bench and release the set screw and out everything will press out and the same way in reverse and if the tube screw hole is screwed up you will have an adventure
i always use a hex screw you will have a lot going on so the less fumbling around the better
 
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so, the answer is NO i got an early model 5 with the full grip frame maybe 10+ years ago and i had to get a piston out of Germany to fix mine as it was missing
now if it is a 5G the you would have a better chance
so the model 5 - model 5G - model 5G mag or lp5 all take a different piston
now this is Waffencenter Gotha in Germany the pistons will be listed 5 first, 5G next, and 5G mag
https://www.waffencenter-gotha.de/s...t-mit-Luftkolbenmanschette-DIANA-5::1881.html

https://www.waffencenter-gotha.de/s...-mit-Luftkolbenmanschette-DIANA-5G::1882.html

https://www.waffencenter-gotha.de/s...olben-mit-Dichtung-DIANA-P5-Magnum::7542.html

you will see that Waffencenter is have the early model reproduced and that is something that they do
front seals are the same
it helps for info but not your repair
to get a piston out of Germany would be about 100 euros or say 110.00
Thanks, I have been checking around other European parts suppliers without success. Sent them an email waiting to hear back.