Open them up and take a look. Am a tinker at heart, and have had every PCP open at one time or another (and most of them several times), Haven't found rust, and at least one of the guns has been in use with a pump for several years down here in high humidty land (Southern Louisiana). Can certainly see how it can happen, and perhaps it will happen sooner or later to me, but I'll keep on hand pumping.
In fact, if I read the Discovery manual correctly, the only two ways that they give the "ok" for filling a Disco are (1) pump and (2) discovery regulated fill tank.
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