Finish on a Dinzag 7.62x39mm '74 muzzle brake

Good day. Hard to believe it's been over a year since I was last here.

Some idiot (who shall remain nameless because my ego is fragile) forgot to properly clean his Saiga after firing corrosive ammunition in it a few months ago. Come back from school for Christmas, get it out, and there is a TON of rust on the muzzle brake, which I ordered about 2 years ago from Dinzag (IIRC, the guy who owns that shop was a member here... is that still the case?).

Well, not knowing what else to do, I dip it in vinegar over night, and that did get rid of some of the rust. It also got rid of the blueing on the brake. I then cleaned off most of the rest of the rust with a Dremel with a wire brush bit.

Basically, I need to put a finish back on this thing at some point so it matches the rest of the rifle. What's a good choice for this? I know there's blueing kits you can buy at stores but I'm not sure how appropriate this is for this particular application.

Attached is a helpful picture of what rust may or may not look like. I'm currently soaking the brake in vinegar to get all of the blueing off.

Eh, I like the Gun-Kote idea. One of these days I'll save up the cash to get the rifle media blasted and get the whole thing done at once.

By the way, what's the running cost on something like that?