I have an M&P45 that sports an Apex DCAEK with an old style slide stop (no detent). This gives the trigger no tactile reset. I have an M&P40 with the new slide stop that provides a very distinct and tactile reset. I was told that the M&P45 and M&P40 do not share the same slide stop and S&W hasn't made a new slide stop for the 45. I've looked at the schematics and it appears that all M&P models use the same part number for the slide stop. Is this correct?