i have noticed a few spots on mine. unless you have a stainless slide. the taurus is definitely not stainless. once i seen it starting to do that, i just clean and wipe with oil after wearing it. seems to have prevented anything damaging in the past 4 years of wearing it on a damn near daily basis. you should clean your carry gun(s) weekly to keep them functioning correctly. fuzz, dirt and shit has it's effects.