Back in 'the day', I'm pretty sure the only time you would see shiny anything on a gun would be when it was new or military. When hunting (for anything), the sudden glint off shiny furniture could startle game. Reflection could also reveal your position to an enemy miles away. (I have signalled helicopters to me with a tiny mirror from a mile or more). Military probably wouldn't giva hoot most of the time, but I'm pretty sure a lone trapper in hostile territory would hoot a lot, and let the brass get dull asap. All that aside, if you like shiny brass; go for it; it's your gun.