S&W M&P shield trigger upgrade?

I put an Apex in a Gen 1 M&P full size.
It was worth it, but those triggers were not great .

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any of you done this and if so, was it worth it?

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I did on an M&P compact and a Shield 1.0. It wasn't life-changing but it was a measurable improvement. You'll need to be somewhat mechanically adept and have some tools but it didn't require anything fancy.

When I looked at the guts of my Shield Plus it looks like they come already improved from earlier versions. At some point they just started copying (or they were inspired by if you prefer) the Apex sear geometry and they started making it standard. You could almost definitely polish the contact surfaces and make it a little slicker, because for a massed produced gun $350 gun only goes so far, but I wouldn't buy an entire kit unless there's something worlds better than the Apex out there.