It looks like brass and copper may become special run items rather than regularly available OG options-- I picked up a set of copper AD20.5 scales during the St. Paddy's Day special. I highly recommend grabbing a set when you can, they are phenomenal!
I bought the copper scales for my Demko 20.5 and am very happy with the both the build and the added weight. They fit perfect. There is engraving on the inside as well as an added plus. I suspect I’ll be buying more for my other knives also.
Put my new Fat Copper scales on my 20.5 yesterday and man does the knife look amazing especially with the black blade, hardware, Lynch black Clip and OG black backspacer. Not only does it look amazing it feels like a completely different knife it’s got a solid quality feel to it VS the crummy grivory ones that came on it. Do yourself a favor put some OG scales on your 20.5