My friend's Kimber (don't know what model it is) does the same thing with ONE mag (came with it), the other 3 or 4 he has don't do it. He hasn't been able to solve it either. That mag works fine in about every other gun he has, and other owner's 1911's seem to have no problem with it. It also randomly jams for no apparent reason, once in a while, usually on the second shot.
Sad to say, ALL of his 4 high buck 1911's have some sort of issues with feeding, either it's like the above problem, or it's entirely random, but all of them, even after being well past the break in stage, have issues. He's kind of down on the whole 1911 experience. His rough looking old Colt shoots fine though, it belonged to his dad, who carried it in a homemade holster that really shined it up over the years. It has a lot of minor scratches and dings too, but it makes the high dollar ones look very bad. My $350 EAA Witness chewed through 200+ rounds the first time I shot it, with the only problem being mags had to be really slammed in, or they would pop out on the first shot. A couple of dozen inserts and removals cured it totally, and so far, with it coming up on 1000 rounds through it, it's had ZERO problems, even when shot with as weak a grip as I could hold it and still fire it..
