Originally Posted by Saudade

Just to be clear, an M&P without the mag safety has one "lever" on the sear housing. You must move it yourself to lower the sear for take down so you don't need to pull the trigger.

The mag safety mounts on the same pin as the sear disconnect and is spring loaded. Once you removed the mag, the mag safety disengages the trigger bar so it can't be fired.

This sear housing has no mag safety. Note there's only the "yellow" lever you need to flip on disassembly (yes, you can pull the trigger if you prefer).

Attachment 476738

This one has the mag safety. The mag safety lever is circled in red.

Attachment 476737

Here's a view from the top. You can see the mag safety lever protrudes into the mag well. The "yellow" sear disconnect is still retracted. The other "post" is the ejector. It doesn't move.

Attachment 476739