I SEE THE ADVANAGE TO HAVING ONLY ONR GUN. O ring question...

I have crickets, Uragans , vulcans, Veterans, Mutants Hubens, Pistol/rifle.Notos, PP750, and reximex ,, I have the 225 pc sae, and meteric on ring box from fright harbor Nitrile if that means any thing, also 270 pc oc green oring seems to be all sae Bot a box of red o rinds about 250 pc no size markings and onother red box wit a huge selection of O rings on T post,,, The ones the made the day to day fixing my Vulcan ii and my PP750 pistol was a set I bought for my Crickets 15 years ago...
Can I buy a box of many O rings just set up for PCP air guns in there common size with the correct O rings in them, Not all rubber O rings are made the same, Is there a best ONE? I bought some from the O ring store that some one told me about for the barrel of the RTI , I think I bought 50, And I have almost used them all I have 5 barrels for my RTI guns , So 50 was just right,,,, And NO I am not good with a caliper, OK but not good,,,,
I am wide open for suggestions , Lets here them,,,
Mike
 
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Yep, The O-rings Store. But I only buy the he sizes I need. They have a downloadable grid you can print, place an o-rings on, and use a phone app that will estimate the size. I use this as a double check of my measurements or the manufacturer part call out.

If you to an get a schematic of your gun, some manufacturers list the o-rings sizes. I made a spreadsheet last week of the o-ring sizes for my guns.
 
here you go
Here's a hint regarding the O Ring Store Kit
The AS568 O Rings in the kit listed as sizes 003- 117 (SAE sizing) actually match metric sizes often common on imported airguns,
You can find the actual metric dimensions in the specifications for each ring.

Hope this helps

Just my 002
Edward