What did you do to unbind the magbox?
Mine was bound up too. I simply filed the bottom tabs of the box where contact was being made with the stock.
That's exactly what I do too, except I use a dremel tool. Pretty simple process. I take about an 1/8" (maybe less) off the two in the front and one in the back.
Getting another from Kimber won't solve the problem. It will be the exact same size they ship with the rifle.
