There's a very long thread about this optic on the last page...you might want to read that...there is some *very* good info there from a guy at Elcan. Or, shoot Mike @CSGunworks an email...he's getting some in this week, hopefully. I guy named Hepcat has one, but he posted that he's gonna sell it in favor of something a little longer range. You could try emailing him. (assuming he's not the guy who has it on the EE lol...I looked for it, but never saw it there).
It uses a built in ARMS mount, so it should be good to go. Bear in mind that *some* ARMS mounts loosen up over time; I would NOT be mounting/unmounting this optic a lot based on that. I have one ARMS mount that is loose on one particular rifle, but it's fine on all the others I have.
I ordered one of these myself from CS. Hopefully I'll have mine withing a week or so, and I can give you some first hand info.
I've looked through a couple of Elcans, and I have to say the glass is *amazing*. If the DR is as good as their previous models that I've seen first hand, you wont' be disappointed there.