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Are there any long-term durability concerns with the aluminum frame?
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The Colt Lightweight Commander was generally considered to be good for at least 20,000 rounds. That was in 1950 and aluminum alloys are much better now. Kimber tested their alloy frame 1911s to 20,000 rounds and found no appreciable wear. I knew of one IDPA shooter 10 years ago who had put 60,000 rounds through his Kimber and it was still running strong.
My Ruger SR1911 Lightweight Commander in 9mm has held up just fine for about 1000 rounds, and I think it will out last me as a concealed carry weapon, shot periodically for proficiency. 50 rounds a week for 10 years will be 26,000 round, and even at $6 per box for practice handloads, the ammo cost will be $3,120 - about 4.5 times the cost of the pistol itself - and I'm pretty sure the pistol will run just fine for a lot longer than that. Consequently, I'm not worried about life span of the frame.
I have other steel framed 1911s for round intensive activities like tactical pistol match shooting.
My major beef with it was a lack of night sights, but with a dove tailed front sight, it's an easy fix: