Restoring my collection of DM 4-7 collection. Just wondering that back in the day it was all about urethane O-rings in the internal top hat ? It seems that the modern markers has just replaced those with BN type of O-rings. It's a bit hard to get these UR-o-rings from the local stores so these old DM's are fine with BN70 o-rings or is there benefit for example to use BN90-orings for the bolt internals to increase the life.
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OEM didn't care about longevity, an engineer surely picked UR for best fit for application. You'll never notice the functional difference going to buna and oring life on the fuse bolt system is a nonissue. Not having UR degradation is worth it alone IMO
90 will last longer
50 duro will allow you to set LPR materially lower esp. in the 017 positions (and 015 if you want to push)
Search "razgriz orings pbnation", he tested this space pretty well and made kits a decade ago
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