Originally Posted by Drachen
It's been a while since I've owned a mag, and even longer since I've tried to tune one. So I apologize if this seems like a rookie mistake lol.
I recently got one of the 2k9 Micromags, and a Shocktech/AM valve and reg, with the level 10 bolt. Yesterday, with the small paint we had, I was getting pretty low velocity (230-240) with a approximate .689 stiffi barrel. The velocity adjuster is all the way in, I cannot turn it any further if I wanted to.
Though when I went with a very small underbore, with my .670 brass insert on the Freak, I was getting between 275-284. It is usable with that. Got a little lower with a .679+ sizes. I would just keep underboring, but I'm afraid in the summer when it gets warm and humid, a underbore that low might start to make problems. Either too low and breaks, or too high and low velocity.