I bought one of the purple camo jobs and gave it a shot of Duracoat. Been shooting it every week for three years and it still looks new. Sure, you have to disassemble the lower but that's no big deal on an AR platform. On the upper, if you want to leave the barrel blued, slide a piece of PVC pipe over the barrel and spray away.
Krylon will probably wear pretty well if the gun if properly prepped. That should include numerous wipe-downs with lacquer thinner or acetone.
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