I to have both and there both authentic the kayfun is built better the threads are smother the Finnish is nicer it has more weight to it
the Russian has an adjustable pin in the bottom of the 510 but I have never had any issues with the Kayfun not connecting to any of my devices The kayfun is built in Germany and the Russian in China with all that said they both work equally as good![]()
I really have to disagree with this....I have both as well, and build quality for mine is identical....the only difference is the metal used in the Kayfun is softer.
I work in a rough environment, and I beat the CRAP outta my mods. If you saw the chunks that I have knocked out of my Provari....
Anyways, the Kayfun's thread cannot stand up to the same abuse..