Well i brought my M&P .40 out for the 2nd time tonight. i shot 250 rounds through it bringing the grand total to about 450 rounds since i bought it. not a jam, or any kind of problem thus far! i love the way this gun feels, and everything about it. I even brought my roomate who's never shot a pistol before and he liked it too. lol, he may even buy one! well guess i'll finish cleaning it now, just wanted to share my experience.