Author Leroy Thompson had one. He was an Air Police officer; commanded Combat Air Police units, I think. Jungle ambushes of enemy near USAF bases, etc.
If he sees this, he may comment further.
About then, CIA agent Harry Archer had one in S. American jungles, training with USAID elements. It held up in humid conditions a LOT better than his nickled M-19! Killed tapir, jaguar, brocket deer. He did use hot handloads.
We corresponded, but he also wrote about his guns in, Gunfacts.
Archer is deceased, but led an adventurous life. He designed the Chute Knife for knifemaker R. W. Loveless.