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While not an optic mount, I've had dovetail filler blanks and dovetailed sights that were a bit loose. Or something I wanted to re-use from my parts bin on a different firearm that were loose for the dovetail I wanted to fit them to.

I've taken measurements of the old sight that fit snug, and compared them to the new sight that was loose, and used JB Weld, or a similar 2 part epoxy to build up the base of the sight or dovetail blank, or the dovetail surfaces very slightly. After it dries/cures, I've used a fine file to fit the part to the dovetail. This process has worked well for me.
 
Your dovetail is too loose. They need a tight friction fit to have any chance of holding something as large as an optic, and even then that is asking a lot of a dovetail. It can be done, but probably not with what you have.

Of course as others have said the best way is to mill the slide for the proper optic mount you plan on using. No adapter plates, no fuss, just a direct mount to what you need. Having a slide cut is not that expensive, typically $200 or so, depending on what you want. That may actually save you money by the time you buy a bunch of dovetail optic mounts trying to find one that works. And that is assuming your "adjustable sight" was not a bubba job that wanted you to destroy the sight mount by milling off a few thousands so it could work with a standard sight dovetail. If that is the case then you probably will never find a sight mount tight enough to work.

Before going off on that endeavor I would get a known good rear sight and see how tight it is in your dovetail. If it just slips in its FUBAR, it needs to be tap-in-tight to be correct spec. And you should find the lightest optic you can to mount on it. And maybe just skip it and mill the slide, just to be sure.
 
Use a Leupold Deltapoint Micro sight. That way you don't have to fiddle-fart around with adapter plates and all the other nonsense.
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Use a Leupold Deltapoint Micro sight. That way you don't have to fiddle-fart around with adapter plates and all the other nonsense.
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I have one, that was my first attempt, dovetail is wrong for the Shield EZ, but fits my Shield Plus perfectly, but I already have a Romeo X on it. Thinking of having the dovetail on the Delta point remilled to correct size. This was a possible workaround
 
I have one, that was my first attempt, dovetail is wrong for the Shield EZ, but fits my Shield Plus perfectly, but I already have a Romeo X on it. Thinking of having the dovetail on the Delta point remilled to correct size. This was a possible workaround
You originally said you were putting it on a S&W M&P, not the Shield EZ, thus my confusion.
 
This is what I did. I took that stupid red dot off along with the plate. I stuck the plate in the box and traded the red dot for a sweet Remington 8. Now I have no more stupid red dot and a cool Remington!

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Have you checked the price of a machine job or a slide?
Buy another gun instead.
Back from the shop - Pewnitions in Salem told me it took them way more than the 2 hours ($250) I was actually billed for, they just couldn't justify charging me that much more than the pistol actually costs.

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