Mark, my Shield .45 has a S/N prefix of HNM, and box shows a build date of July 2016.
Safe to say yours is a more recent one. Sorry I couldn't narrow it down more.
I think my .45 is going to be my favorite of the 3 M&P's I have.
Great trigger and accuracy, power in a smaller package but not so small you can't shoot it well, some recoil but nothing I can't shoot all day if I wanted.
Can't help but like all those attributes.
I've been amazed at how controllable small .45s are. It could be due to lesser velocity, but I think more due to a lighter slide. I've often wanted to put together a competition gun with a red dot and a 3" barrel. I'll never do it but I think it would be a winner.
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