FWB P44 probe 0-ring

[KDZ]

I got the impression that my P44 was shooting inconsistently* so checked it with a chronometer. Two 10-shot strings using 7gr RWS basic pellets:

Mean 328fps 325fps
ES 40 57
SD 17 17

FWB documentation indicates factory velocity of 150 M/s, which is 492 fps: The gun is shooting very slow, about 65% of nominal

Borrowing a test from air rifle, I shot the pistol with a 1" patch of paper towel sitting over the chamber where the probe inserts. Sure enough the patch goes flying, indicating an air leak between the probe and the chamber.

The manual calls for 4mm X 1mm o-ring on the probe so I ordered some. Anything else I should look at?

Thanks

*Couldn't be me, right?

[David M]

Little bit of lube when you put the new O ring on.

[deadeyedick]

Silicone grease only as lube.

[Gwhite]

Silicon is great for O-rings, but not much else. Get a small tube of SuperLube synthetic grease, which works just as well on O-rings, and can also be used on things like cylinder threads.

https://www.amazon.com/Super-Lube-21010 ... B005R2NIIC

[KDZ]

Thanks guys will do

[David M]

My favorite is Festo Pneumatic assembly grease.

ef0a0ac1ecb644b58de784a4df719462.jpg (18.63 KiB) Viewed 1548 times

[KDZ]

So the O-ring from Amazon isn't correct - much smaller than the one on the probe. FWB P44 exploded diagram indicates "O Ring 4.0 x 1.0 – 4.9.0001".

This is the undersize Amazon O : https://www.amazon.com/dp/B09CL3VZ6L?re ... title&th=1

Does someone know which O-ring to get?

Thanks

kz

[Pistoley]

This is the genuine one, but shipping is more than the seal so I would order several or other stuff to make it worthwhile.

https://www.ebay.ca/itm/374825198999?_s ... R7q7urjTZA

[KDZ]

Thanks! I ordered two

[Gwhite]

So the O-ring from Amazon isn't correct - much smaller than the one on the probe. FWB P44 exploded diagram indicates "O Ring 4.0 x 1.0 – 4.9.0001".

This is the undersize Amazon O : https://www.amazon.com/dp/B09CL3VZ6L?re ... title&th=1

Does someone know which O-ring to get?

Metric O-rings are usually specified by the internal diameter & cross-section. The FWB spec follows that convention. The O-rings from Amazon have a 4 mm outside diameter.

[Azmodan]

https://buinger.com/Feinwerkbau-seal-ki ... ls-P44-P11

[Dmaryakh]

Figure out which seal you need here - https://www.feinwerkbau.de/en/service/d ... ftpistolen

Then can order just a seal or entire seal kit from SportShootingDepot (FWB dealer) - http://sportshootingdepot.com