Originally Posted by Themckane
it does look like an adapter .. it even has a leica cap..
anything special I need to know before trying to take it off?
It should come off fairly easy, it is easier to unscrew the lens when it is mounted on an M camera but a clean rag covering the M adaptor as you hold the lens with one hand and turn the rag covered adapter with the other hand have loosened the most stubborn M adaptors attached to an LTM lens that I ever came across, unless (Yikes!) the previous owner used glue or Lok-Tite on the threads, unlikely but it can happen.
Bonus that you got a 40 dollar M adapter with the lens.