I made a Titanium striker hammer and valve stem for a Pardini K60 CO2 pistol in the late 80s. The standard Pardini steel hammer weighed 11.25 grams, but the titanium substitute weighed 5.91 grams.
The lightweight, titanium hammer did not seem to perform better than the standard one. And to the downside, it, and various aluminum versions caused more galling problems that offset any benefits. Turns out that steel was a fine material, not to mention economical.
So, the project itself was more intriguing than the final results, because the learning experience was priceless. Turning titanium on the lathe was both challenging and fun. It required construction of a water cooling system which was the challenge. The fun? Holding 1/2 handful of titanium shavings at shoulder height, lighting it with a match, letting go, and watching it disappear before it hit the concrete floor.