Colt already knows exactly how much reliability goes up with a more optimal cyclic rate. Likewise, when we developed our 300 BLK guns we did a week of high speed video studying this.
AAC barrels are nitrided, so that adds no thickness, and so we already don't have to deal with a coating layer.
We also control the bore cross sectional area to a drawing, and likewise, a layer of chrome would raise the variation in bore dimensions.


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