My new Thompson Icon doesnt have a melonite barrel but it does have 5R rifling and the accuracy is phenomenal so I have to give more credit to the 5R rifling. I am shooting the Thompson and a Winchester both with the same length barrels, both with the same twist rate but the accuracy of the 5R barrel is way better than the other. Neither rifle shows any wear to the bore so I am attributing the extra accuracy to the 5R.
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Grover Oathkeeper
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