If you were truly after "durability," I doubt that you would be trying so hard to find CNCd bars. Bars are forged or drawn for a reason - - part of which is to alter the metal at a molecular level by something called grain-aligning. Metal that has been formed in such ways is actually stronger than the parent-metal it originated from, because the process of manipulating it actually realigns the "grain" of the metal to impart more strength in the directions of most stress.
With a CNCd piece, you can only rely on the ambient strength of the parent-metal because all you are doing is shaving away portions of it to achieve the shape you want.
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Originally Posted by Mark Twain
"Don't argue with stupid people; they will drag you down to their level and then beat you with experience."