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The reason people use stainless is because it has less throat erosion than normal blued or phosphated 4140. The normal way to reduce that erosion in chrome-moly is chrome plating, but that adds a layer which may harm accuracy.
Nitriding chrome-moly results in even more corrosion and erosion resistance than stainless but without the accuracy-robbing layer of chrome plating. Stainless is not better than nitrided chrome moly steel, and AAC barrels are match grade. Also, AAC barrels are engineered to a drawing based on having the actual Remington 700 action drawings, and with the threads that are compatible with sound suppressors. If I said who makes them, our competitors would make a beeline for the same company and skip years of expensive testing I had to do to find who was best.
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R&D for AAC
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