I forget what this pin is called, but it holds are the striker-fired parts in place, and you can see it on the top of the slide and on the underneath side. To do a complete disassembly of pistol (Shield and other M&P's) you punch this out of the slide. What is it called? And where do I find a replacement?

Are you referring to the extractor pin? That's the only pin on the slide that you need to punch out. This only allows you to remove the extractor and its spring. The internals of the slide are removed by the backplate and the removal of the rear sight. Contact Smith and Wesson for replacement pin.

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M&P40c/15-22/SD9VE/Mossy500

Yes, thanks. Just wanted to know terminology.

It is a roll pin, if you are referring to the pin that holds the whole sear assembly in. The pin goes through the frame (holes on each side of the frame). You can get them from S&W parts. They call it a coil pin. Or you can take it to the hardware and see if they have a similar one. It will have to match the outside diameter, but if it is too long, you can grind it down to the correct length.

Bob

He's talking about the vertical pin in the SLIDE.

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M&P40c/15-22/SD9VE/Mossy500

Easier way than going through all these explanations.

Bob

In the early models, this pin is solid and extremely difficult to get out. It is a roll pin in most models, though, and S&W recommends replacing it if you take it out. There's not much of a reason to take it out if the extractor's not messed up.

Bob, I'm talking about the extractor pin not the roll pin that holds in the sear assembly. Thank you for the thought though.