[mp9werks]

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.

 

[mp9werks]

^^^ You can't remove the safety and still have a functional firearm, as the sear would absent!
That might befuddle a zealous DA.

 

[mp9werks]

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.

Rick M is correct. Thanks for pointing it out.

I don't know what I was thinking when I put those lines of prose together.

BelFrom my Anatomy series 1911 Manual:

 

[mp9werks]

It's a pretty simple mechanical situation.