search nitriding on here. u will find out all u need.

in a nutshell its a special molten salt bath thats changes the molecular composition of the surface metal which makes it super hard and very corrosion resistant. that also helps w barrel errosion from hot loads or barrel burner type calibers. they say plain CM or stainless polished finished give a almost blackish blue type color and matte finishes give a smoother blackish finish.

brian