I have the authentci Russian 91 v2 with the new pin and my 510 connection part leaks no matter what I do to it. You pay 100.00 for something to have it leak is bull..I love how it works but the leaking is a issue for me. I can't find a fix and replaced the little black o rings and still leaks.
My wife and I have authentic R91%s and we've both had the same problem: e-liquid drooling out of the 510 contact screw (adjustable on ours), which feels extremely sloppy inside the inner screw. For us it's been intermittent, not constant, but seriously annoying when it does happen.
In the version we own, the teensy o-ring obviously doesn'tand can'tfunction as a seal. I'm guessing it's only there to prevent users from over-tightening the contact screw & slacking off the inner screw when you realize there's no connection, thereby allowing the upper block to spin etc. etc. You're right, it does seem like b.s. on a $100 tank.
I'll be checking out rebuild kits at the sites suggested. Nice to know there's a potential solution, anyhow. Helpful thread, helpful forum!

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