Barrel "O" ring size for the Dragon Fly/Storm Rider Rifles

[Nvreloader]

Hey Guys

Need some help here, Please...

Went to start the DF I 22 cal Tests, and found out that there is a leak,
coming from the action/bolt Jct, checked and found that the very small Bbl "O" rings
are no good.
First 3 shots were 200/300 fps for 8 pumps, with 14.0 gr Crosman Pellets.

Checked all my "O" ring supplies and I don't have the size needed.

These bbl "O" rings are approx .030" thick and .295/.300" Inside diameter.

Checked the "O" RING Store site and there is no "O" Ring that is close.

I know that the Stormrider/DF II have the same dimensions...
for the barrels and bolt "O" Rings sizes.

Does anyone KNOW the correct size, for the parts?

Tia,
Don

[Nvreloader]

The bbl "O" rings are these sizes,

M0.8cs x 7.9mm or M0.8csx 8.0mm
M1cs x 7.9mm or M1cs x 8.0mm

Thanks Grin Reaper