Will the apex fully machined sear work on the M&P shield W/O thumb safety?

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Yes it will work. The safety has nothing to do with the sear, when the safety is on (lever up) the safety lever tab blocks the tail of trigger bar from moving rearward, thus the gun is safe as the trigger can not move. Even though Apex lists the Shield kit and a separate kit for the Compact and Full Size 9 and 40, they all use the same parts. The only difference is the Shield kit uses a slightly smaller diameter trigger slave pin, used to ease the trigger spring installation, while the other kit ships with a larger diameter slave pin.

Bob
 
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I just swapped my Apex kit over to the new non-safety frame, no issues. I didn't need to adjust the trigger bar.
 

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