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I had a couple of sets of barrels done gratis by Jack back in the 80s and am still running them.

My understanding of the process is that the honing blocks are made in hard leather or similar and the honing fluid has silicone nitride particles in it and the action of the leather blocks forces the SN particles into the cast iron bore and creates a non wearing surface. some suggest that this is at the expense of ring wear but that has not been my experience.