I'm using 954 Aluminum Bronze for an item I make. Works great! It's hard and will crack rather than bend, the reason I selected it. Buffs to a gold like color but after time it will get to be an ugly yellow. Is there another alloy in Bronze or Brass that is strong but will not change color over time. I see the brass door knobs stay a shiny Gold color even on those outside. My item is not for outdoor use though it is used out doors. (gun part) I have made a few from Titanium (AL6-4V) works but is expensive. I will not use Aluminum.
Nickel-Aluminium-Bronze can be heat-treated. Whether you NEED that or not, a side effect is that is resists tarnish longer.
It is "close enough" in appearance to Gold that salesman's samples in the jewelry trade have used it for scores of years to reduce weight slightly and reduce insurance coverage costs
greatly, the Diamonds and coloured stones in the samples also being artificial .
Not a new need. Look it up. See if that could help.
Perhaps you could also plate it? Effectiveness depends on wear and other exposure factors, of course.
The OTHER option is controlled, but stabilized "tarnish". A "browned" Bronze often called "antique" or "Oiled" bronze. It can be carried all the way to black?
Might not have a golden "bling", but for a firearm? Could be a subdued dark colur of lesser glare might actually be a most-welcome option?
I'm not "into" camo, nor sneaking about nor strutting around PRETENDING I was back in a Southeast Asian jungle. But neither do I want "Sundance kid" hoorhouse-gaudy shiny or sparkly bits around any of my "hardware".