I purchased a S&W M&P 45 a few weeks ago, the guy who sold it to me said the gun only had 100 rounds through it. I get the pistol home, only to find out there is another registration form to another guy, so I'm the 3rd person that's had it but the gun is less than 9-10 months old. There isn't much wear to it, and it doesn't look like a lot of rounds have been put through it. I get the pistol home and start dry firing it, feeling out the reset etc. The trigger starts to not reset, did it once or twice then started doing it every single time. I contacted S&W about 17 days ago, told them what happened and they sent me a shipping label for warranty repair services. I've been wondering what's going on with the pistol, and just got a letter in the mail from S&W today. They sent me a letter saying that the sear has been altered, and it will cost $70 to replace it. (which they're not covering anything of) I was so freaking mad. Fuming right now. I don't know much about the M&P, I never touched the sear and when I bought it the gun looked fine. I'm glad that I didn't carry it and trust my life to it, but paying top dollar for a used gun and then having to pay $70 which puts it at almost the cost of a new gun REALLY rubs me the wrong way. Anyway, does anyone have any advice? How does someone "alter the sear"?????