Yes. I did Xm colt gray on a Tonys custom uppers aluminum stock buffer tube 7 years ago. Tube is commercial spec and was a very smooth semi gloss black. The stock had a dull gray rough finish almost like it was parked. I used gloss black high temp engine paint on the stock and latch lever and baked in a toaster oven. I degreased and did one coat moly Resin on the buffer tube and baked per instructions.
There’s some streaks in it now revealing the black underneath but it’s not bad enough for me to have pulled it to redo.
If I was going to do it again I would do 2 coats and bake the first one longer. I believe norrells says that this will result in a slightly green tent to the gray like greenish parkerizing. Then I would do a second coat at the normal time/temp.
Putting it on a tube with anodizing may yield better results vs the extremely smooth/slick finish on the Toney’s buffer tube.
It ant museum quality but I’ve been generally pleased with the results considering it’s been 7 years now.
I’ve also done the back end of charging handles too.
Hell maybe I’ll pull it and fallow my own advice.
John44