From this experience I have seen o-rings get destroyed from improper lubricants, placement in improper pressure applications etc. In my work, I work with & have worked with lubricants, industrial filtration for gas turbines, scuba air lubricants, food grade lube, rubber products, gaskets, seals, conveyor belts, hose etc. I do not recall an o-ring being inside the new cylinder of my 480 from Larry. It also had a smaller, second o-ring either in the cylinder, or in the groove at the end of the "stem." Both o-rings were rather soft & were dark green(rear), lime green(front or cylinder o-ring).
The original 480 had a large o-ring back at the gun under the cylinder "shroud". I bought a second cylinder(red) from Larry in 2005 when he had extra new ones for sale(no longer has any-I checked last week & got an answer back). I bought it new with one cylinder at Camp Perry in 2002(?) from Neal Johnson Shooting Supply. Pics of my 480 with o-rings are attached.
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