It is single stroke (I think all M3's past ~s#910000 are single stroke). I was told when it was given to me four years ago that it had recently had a CLA, but I never received any hard proof on that. I went out and shot one roll of film with it...the rest of the time it has sat on my shelf.
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"There isn't much that I feel I need, a solid soul and the blood I bleed."