I could see wanting a stainless steel lower with a full-auto M16. The one area that tends to wear some with lots of use and over time are the holes for the pins. A little added weight in that area might also make full-auto fire a bit more controllable.
I suppose a stainless steel lower might also be a consideration with an echo or binary trigger system. Beyond that, I don't know what a stainless steel lower really adds to an AR? I do like having a stainless steel charging handle on one of my AR's, however. While I've never bent a charging handle, it does happen and it would render the gun pretty much useless.
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