Just got a new FS 9 mm M&P with thumb safety. During an attempt to take it apart for familiarization, the following part fell out
Since I was performing a step denoted as "lowering sear deactivation lever into a magwell", I am assuming that above part is said sear deactivation lever. Aside from why is it covered in a sticky residue, my questions are
- why did it fall out and what is it that I can do to put it back?
- I can't take the slide off the frame after turning the takedown lever. Does it have anything to do with sear level being out?
- Should I just send it back to S&W, or all of that are a minor easily correctable issues?