Oringsandmore.com ships fast. Take your reg apart and pull the sizes. Metric more than likely on the inside o rings. The outer one is the same size as the rest of the o rings in the marauder air tube- #118 I believe(it’s been awhile. All the marauder o ring sizes can be had with a Google search. I’ve seen the list)
If it were me, I’d order up o rings for the entire gun, to make the shipping cost worth while. Order for your hand pump, too, and don’t forget pcp fittings have o rings like the female quick disconnects.
To be honest, in the three o ring “kit boxes” I’ve bought thru out the years, very rarely do I find the exact sized o ring that’s needed for something in the gun. It’s usually too small and stretched to try and make it work or slopping a bunch of silicone lube to get the too thick o ring to slide into place. So anymore I just order the right ones and in a week I have them
