Is the maker Caspian Arms? If so it looks like it is a mix of 2 types of stainless steel.
what you are looking for is acid etching. managed to find this discussion of a Caspian Arms damascus 1911 slide.
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the slides caspian sells are two variations of stainless steel. as you work on them they do not show the variations - they just look like a stainless part. you must use an acid bath to bring out the damascus pattern. the acid etches the different steels at a different rate. a quick bath produces less effect than a longer bath. more polishing of the part will highlight the effect as well, slightly though. the biggest difference is the amount of time it spends in the acid bath.
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General process of this is easily findable with a google search of "stainless damascus etching" most of the results will be about knives but that is ok because it is the same process.