Green Bay Anodizing does firearms and they have hard coat anodizing as well.
Quick turn around and really cheap. Can't speak for their work on re-anno, but they've done some 80% lowers for me.
https://www.gbanodizinginc.com/services/
Stand-alone policy.
I have State Farm for home/auto and to add any kind of firearms insurance through them is absolutely insane (like 10x's the amount).
Looking for a RPG7 subcaliber 7.62x39 training device, like the Czech PUS-7 or similar.
Serious buyer. Will pay finders fee for anyone that can lead me to a successful purchase.
Photo for reference (not my photo, pulled from thefirearmblog.com)
I had a cup on order with them (Vega Ballistics) for quite a long time and never got it, ended up getting my money back after struggling to get any communications from them. After buying an original cup elsewhere, I contacted them about TRUMP rounds, and never heard back. Which leads me to why I suggested someone else get into the game - money to be made for someone who actually wants to sell product.
Lots of people looking for 60mm cups and tubes, if that's something you'd consider doing with it. I looked for 2+ years and found nothing until I lucked into a fair priced C&R Firestone M2.