This pistol was manufactured in November 2009. I bought it new from a local gun shop. Out of the box, it would fail to go into battery on the last round in every magazine, with PMC, Cor-Bon, WWB, and Independence ammunition. I fired the requisite 500 rounds through it, and as that period ended, the pistol was also starting to lock the slide back on the 3rd or 4th round in the magazine about every 3rd mag. I tried Wilson, Tripp, and Wolff magazines. I bought a Wolff XP spring for the stock Kimber magazine. Nothing worked. The other magazines actually made it worse. I contacted Kimber, and spoke with a customer service representative who emailed me a UPS slip, and told me they would fix it, and to expect a 4-6 week turn around time. They said they would call me the day they shipped it, so I would know to expect it. I received the pistol back in just a shade under two weeks, and no one called me when it shipped out. I shipped the pistol to them in perfectly clean condition, they shipped it back to me after test firing it, filthy. If it had been lost in the mail, it probably would have rusted. So I cleaned it up and took it too the range. 2 mags of Cor-Bon, perfect. I'm feeling pretty good. After all, I do love this pistol, it's sexy, and it shoots tight, tight groups. I love 'em tight. Then I fire a box of Federal Champion 230gr FMJ. Failure to go into battery last round of every mag. A box of PMC bronze 230gr FMJ. Failure to go into battery every mag, last round, and slide locks to rear mid-mag. A box of Independence 230gr FMJ. No malfunctions, thank Jesus. A box of WWB JHP, 1 stove pipe. I want to get rid of it, but I don't want to dump these problems onto someone else. It jams more than a 50 dollar Saturday Night Special.