You never know. I picked up a BEAUTIFUL Mod 15-3 for a song. When one of my agency's range officer checked it for dept specs, it was out of time on 3 out of 6 chambers! Closer inspection revealed that some idiot had messed with the lugs in the star & rounded the edges of the cylinder stop. Pissed hardly describes it!! The gun is damn near new but some jackass with more time than brains almost ruined it. An oversized hand helped the timing a bit but I'm going to have to replace the star & cylider stop it seems.

My advice re the M10 is take it to a qualified S&W armorer or gunsmith.