Quoted:
I have seen a bunch of posts from over the years about guys wanting to remove the sear block out of their preban colts for one reason or another. If you have one in your gun that has it blind pinned through both sides of the receiver like on an HBAR, and the pins fall out, Does that cause any problems in your state?  I saw one locally that had the block removed and both blind pins were out. it basically looked like the auto sear hole just much bigger and a sear/sear pin would never fit in there.

Quoted:
not illegal.

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No laws here pertaining to sear blocks. You need not worry about any of it.

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JB weld and dremel.