What size is the allen screw for the rear sight on a Shield

1/16" is correct. Some have reported that a 1/16"'fit loose, but I suspect they may have been using inexpensive wrenches with poor dimensional control. These set screws are installed with loctite and may be difficult to loosen unless heated. If you look at the notable thread index at the top of the M&P section, I have a thread that shows some tips and tricks for removing Shield sights and also set screws.
 
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My screw was difficult to remove. Ended up using a wood burner with pointed tip to heat up the loc-tite.

And while my rear sight was tighter then my compact or fullsize, it came off just like I removed those.

C-clamped to my desk, with a brass punch and dead blow hammer. Brass came off with some rubbing from paper towel. No dents.

I ended up replacing all my rear sight set screws, because I am one of those special individuals that sweats pure rust, and while the slide survives, those screws rusted something fierce. Hoping stainless set screws fair better :P
 
Need to remove the rear sights to get at the striker block.
 
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