BBQ gun MAYBE, given the high acid content of some BBQ sauces.
But a courting gun?
You NEVER show up at a "target's" house with a shiny gun. It's gaudy, and gives the target's father the impression that you're a dandy just looking for the quick score.
A deep, rich blue conveys a sense of formality, and more importantly, indicates that you have a serious, stable, nature.