Thanks. Shows how little I know about firearms. So the velocity difference between a round and a piston is not an order of magnitude, 10x, it is up to 200 times. Even more reason that a friction treatment result with one item wouldn't be applicable to the other.

I think the number of cycles, with the significant difference between a round and a piston, is probably more telling in terms of whether the treatment would have any lasting effect inside an engine, though.

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