Questions about orings in Empire LPR?
I recently replaced the buna orings in the pneumatics of my Resurrection with urethane orings (except for the 3way, couldn't find the right size). The results were pleasing, but when I took it to Fulda Gap last weekend it started having major problems. The 3way began to leak and the LPR had so much pressure that the knob wouldn't turn. Upon taking the LPR apart I found the 003 oring that fits inside the spring had been shredded (not the 003 reg seat), which in turn sent way too much pressure to the 3way and caused its orings to knick when cycling. The problem was resolved by replacing the 003 oring with an original buna and obviously replacing the 3way orings.
My questions: Is that second 003 oring, which fits inside the spring, a dynamic seal? What's the purpose of that oring?
I'm attempting to get the best performance out of the pneumatics. So I'd like to know if there is any benefit to have a urethane oring on that stem, or if I should just save the trouble and leave the buna oring in there.
Thanks in advance! :tup:
PS: And if anyone knows where to find urethane 3way orings, I'd be obliged to thank you.