About the major drawback to using copper is it's affinity for green verdigris tarnish. Years ago, I had a copper knife, fork and spoon set, which tarnished so easily I was afraid to use it out camping. I was 13 at the time, so about 60 years ago.
That said, I would like to see copper furniture on a flintlock. May have to get some copper and make my own though. I might begin by studying copper alloys, in and effort to find the best material for the job.