If the slide fits and functions properly there’s no reason it would be unsafe.
The one piece stainless slide is actually better for the aluminum frame because it doesn’t have a separate breechblock that must be held tightly to prevent the slide from flexing and putting additional stress on the frame. (That’s why the breechblock retaining pins in older slides should be replaced at least every 5000 rounds.)
“Most men … can seldom accept the simplest and most obvious truth if it … would oblige them to admit the falsity of conclusions … which they have woven, thread by thread, into the fabrics of their lives.” — Leo Tolstoy
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