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The thumb safety could be removed and the firearm safely used (Rule #1: muzzle direction is the primary safety on ANY firearm!) IF its shaft was not also the axle for the sear!

There are two other safeties present: the magazine disconnect and the blocking plunger to the hammer that is activated by the trigger pull, which is like the M&P striker fired models in function, not form.

The original 1911's did not have a thumb safety. I911 's can be used with the thumb safety removed as its axle is not used for any other moving part. View attachment 19024 View attachment 19025 View attachment 19026
The 1911‘s thumb safety pin is what holds the grip safety (GS) in place; and it also serves as the GS axis point.
 

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What does a 1911 have to do with an M&P .22 compact? They aren't even closely related.
MP9’s post #3 in part stated “The original 1911's did not have a thumb safety. 1911s can be used with the thumb safety removed as its axle is not used for any other moving part.”

To which I replied “The 1911‘s thumb safety pin is what holds the grip safety (GS) in place; and it also serves as the GS axis point.”

Whether the information provided is about striker fired poly pistols, 1911s, or whatever; when incorrect information is presented to the internet “world;” it should be factually corrected.
 
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