Hmm just seemed like an odd choice to me lol, thanks for explaining!
We use 6061 our JSF and Apache parts, specifically radar equipment etc.
I am a CNC operator/programmer myself.
The problem with aluminum is there is all kinds of stuff, ranging from soft to hard etc. I dont know if 6061-t6 is on the harder side of it. Thats why i was wondering about it.
Brass sounds like an good option too.