That's very courteous of you @Tnmallen
I know Airgun Revisions listens in on AGN
You might try posting your question there.
You could also send a PM thru that platform
Edward
This is the most recent one that I could find on the Crosman website,
You could also contact Airgun Revisions to see if there are more up to date publications
Hope this helps
Edward
https://support.crosman.com/hc/en-us/article_attachments/201669704/CH2009A515.pdf
I buy individually sized rings from The O-Ring Store
They are reliable, and ship quickly
And have an excellet supply of metric and AS568 O-rings in stock in a variety of materials
https://www.theoringstore.com/store/
When I buy a new (to me) gun I buy an O-Ring kit from eBay seller R&S for my...
I have had my FX Crown MkII 22/380mm for about 2 years.
I have not touched it, not even for a breech O-ring in that time.
It was set up, tested, and tuned exactly as requested by Tony at Talon Airguns upon purchase.
just my 2 psi
Edward
You may this already, but in a pinch, you could try a #110 standard o ring (90 duro)
The dimensions are very close
9.19 x 2.62 mm
Take a look at the attached screenshot
Hope this helps
Ed
I really like it when a company remembers how good their product used to be.
And then reintroduces the high quality as something special, new, and expensive
just my 2 don't-give-a grams
Edward
W
James
Have you considered measuring your spring and trying to locate a replacement at McMaster-Carr?
https://www.mcmaster.com/products/compression-springs/compression-springs-1~~/
Here's a suggestion
If you still have the original threads in the receiver you could use a lane regulator between at the bottle.
Just my 2 scents
Edward
https://laneregulators.com/fx-airguns-boss-al-external-pcp-bottle-regulator?search=FX%20
https://www.ebay.com/itm/115431562827?var=415465249221