FX Where to buy o rings

Oringsandmore, The O-ring Store, Mcmaster-Carr. 3 great places. As long as you have a caliper in your essential airgun tool kit you'll get multiples for sometimes LESS than what you'd pay an airgun manufacturer for 1. FX has sizes in their exploded diagrams (go to FX & look under Support for diagram of your gun).
 
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I've ordered from all the places Gerry52 mentions and they are all fine. You need to know the sizes you want, however, and you will have to order 50 or 100 but they are not very expensive. But a complete set for $20 is less and as long as you do not need multiples of anything that could be a good deal. My guns seem to want to fail certain O-rings much more often than others, however. I shot my SPA guns a couple years before needing to replace anything in any of their regulators and then I had to rebuild several. It is nice when that happens to have dozens of each size. I have also needed a size different from that shown on the SPA parts diagram I have. I don't know if the design changed or my guns are a little off. but each time I had something in a generic O-ring assortment from Amazon that worked. I have a couple of these and they were only about $10 each. I think they are very much worth having as a just-in-case.

But ordering a set for your gun, if you can find one, plus possibly a generic assortment or two even though you won't use most of them is a good starting point. When you have to replace an O-ring more than once, I would buy a minimum quantity from somebody so you have some the next time. To me O-rings are a bit like pellets. You have to invest some in them to be able to enjoy the guns.
 
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@Huntvarmint
I have used this eBay vendor many, many times.
And always received the proper parts,shipped quickly
Here is a link to hi FX M4 O-rings

Hope this helps

Just my 2 rings
Edward

 
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I have bought O rings from hydraulics repair shops for 1/2 century+.

A town of any size will certainly have at least one. They typically have a huge inventory of O rings and can order others. Most of them are quite happy to assist in measuring.
They have funny size and pitch connectors rated for pressure too. It's the only way I got my 250cf carbon bottle online.