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A couple of areas of the slide, specifically the front and the area around the slide stop notch were later hardened even before Colt went to the "hard slide" in the Post WWII period. But the army kept M1911's in service until the end of the .45 era with no special caution about firing them.
I would not be concerned about moderate firing with standard pressure loads; that is what they were made for.
Jim
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