GE (and others) use small amounts of Rhenium in their high-strength "hot parts" engine alloys.
It takes, on average, approximately 120 metric tons (264,554 pounds) — or the equivalent weight of 44 Cadillac Escalade SUVs — of copper ore to produce 1 ounce of rhenium
I think it's running about 5000$ per Troy ounce...
So be thankful S&W cheaped out on their Scandium Pot Metal gun frames
A modern top-break in 38 special, 44 special, 9MM, or ?
Me (if it was designed as a super-compact, light weight, pocket pistol - hence my inclusion of 9mm).
What if it was semi-auto as well (hint, hint...)