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v35b, I think your concerns are a little unnecessary. Yes, aluminum is a soft metal but it can be hardened, to a degree, with alloys. I don't know if the gun makers, Kimber in particular, do that or not. But, keep in mind, copper is also a soft metal. I would be willing to bet if one could cycle the same round, in the same position, over and over again, it would be the copper that gave in first.