The googled Summaron will work on the M2, but if you were to remove the googles it would not focus correctly so you'll need to leave them on.

You should check the googles out as well as the lens. I found one at a store near my winter home, it had just been overhauled by Sherry Krauter, and the front part of the lens was rotating freely (the store owner tightened it up with a spanner wrench), and the viewfinder image was distorted (rangefinder images didn't line up right either). Evidently the prism in the googles is adjustable and someone has to take the time to set it properly, because I had a look through another indentical lens owned by someone else, and it was a world of difference. If you're in the USA, I can recommend DAG to clean and adjust the lens if there are any issues with it.