You sold an 858 because the paint had a f**king chip in it?

This gun is probably not for you then. I regularly cook the paint off the barrel on mine. This is a military rifle not an expensive side by side dove gun. The gun wont rust right away after shooting it with the corrosive ammo unless you live in a humid climate. I've left mine for over two weeks after shooting and had no ill effects. Water, WD-40, a boresnake and a quick wipedown is more than sufficient. Or just shoot it enough that you never have to worry about corrosion.
Talk to Neit or Broncoo about tabbing the bolt. Ive personally never seen the gremlin in mine or my friends 858's, I think its rather over dramatized. Roach did what I believe was a nitrocarburizing or tenifer coating process. They dont offer it anymore AFAIK. Armacoat does a ceramic coating that is supposedly pretty tough, give them a call. Or just Krylon the s**t out of it.
The gun runs fine without tabbing, a chrome lined bbl, and with the factory finish. If the gremlin pops up, then get it tabbed. If not, just go and shoot.