Does anyone know if KNS non-rotational trigger/hammer pins will work on a M&P 10? If so, what size works?

They should work as the M&P-10 uses the same trigger group as a standard AR. However, they add nothing to the rifle other than looking cool.

KNS pins are also the wrong diameter and too soft to be used with a Geiselle trigger

We'll I myself love the pins. I put them on a few of my rifles at home and my work gun has them too. I felt it smoothed out the trigger pull on work gun since I can't replace its trigger. In the other rifles I have I put them on my bench style rifles and they work great

To each their own. For me I like them and am going to put a set I'm my M&P also

Tony P

I have them on my M&P 15 and love them. Now I know they'll fit. I'll be getting a set for my 10 as well.

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I don't have a set but it looks like the ambi mag release would get in the way

I think you're right.

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There is no clearance issues on the M&P10. I have fitted the larger diameter set to mine with the flatter profile locking plates with no problems whatsoever.
The most important benefit of using these upgrades is that wear (in the long term) of the pivot pin holes in the aluminum receiver is entirely eliminated. Even the standard diameter pin size will provide their anti-wear characteristics to your gun.