Add me to the list of compact owners, 9mm, no lock, no mag disc. I shot 50 rounds to check function and sights, all perfect. This is my second m&p. I have a full size that has become my #1 IDPA SSP gun. 1000 rounds through that one without a hitch. If the funds are there when the 45 comes out, I'll have one of those, too. S&W really got it right with the M&P.