That is a normal part of all M&P pistols. I believe that is the end of a spring that is attached to the slide stop. As long as it is not sticking out and blocking the movement of your slide, it's OK. On very rare occasions they will pop out and your slide will get stuck in place. That usually requires a trip back to the factory. It doesn't happen often, though. I have three M&P semi-autos with nearly 30,000 rounds through them combined, and the spring wires are all still firmly in place.
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What, me worry?
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