The only "glass" stones I use are on the hammer/ sear of 1911s. I get the very fine ones for the final polish. Glass stones you use with just water, the other types need a few drops of oil. Never run stones dry.
S&W's seen happy with medium/fine stones. I purchase Norton stones that are 6" long and when they start to loose their flatness, I break them smaller for chasing burrs around the gun.
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