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Discussion Starter #1
I bought a new sear assembly to upgrade my 2007 model year M&P that I just bought, only to fins that the sear had apparently been upgraded already. But, the new sear assembly I just got has the large hole filled with something that looks like a bearing, whereas my original just has an empty hole. I wonder if it may have something to do with the models that have the thumb safety. The one on top is the new one I just got from Brownell's, the bottom one is one out of my pistol. I removed the Magazine disconnect from both of these.

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The top sear housing block has the original Internal Lock mechanism installed. Look closely and observe the center hub of the lock is a small hex nut that can be turned externally by a hex key to lock the firearm trigger bar from moving rearward.
The safety when installed rotates on the rear housing retaining pin, not the center of the sear block.

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Caution: Pseudo-science and / or amateur photos may be embedded in this post.
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Discussion Starter #5
Ok, thank you. Is this something I can just tap out and leave out or does it have to stay in there for this assembly block to function properly?
 

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You can certainly pop it out with a punch, I've taken out dozens of them over the years. Important safety tip: Don't put a rear block w/o lock back in the frame unless you also install the plug that fits that little hole in the frame (where the "key" went).
 

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Discussion Starter #8
I'm good in that area. The hole is plugged. I had wondered what that spot was because it has the arrow with an L on it.
 
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