I would agree with most of what LEO says here, however to be on the safe side, I would give the weapon a good cleaning. I once used tracer to convince an opponent I could locate him even in the dark, which halted his target practice using myself and my partner for the target. This of course was in a river bottom on the Texas side of the Texas-Oklahoma border.
Also, a reinforcement of LEO's warning of back stops for firing tracer. I know of one brand new "fun house" used for SWAT training that burned one night after an afternoon training session where tracer and other assorted pyro's were used during the training session. The boss was not happy, I heard.