I think that Tweak brought up a good point that no many people want to believe. A good barrel and bolt, are the heart and soul of the weapon. Everything else is secondary at best.
In the case of RRA, if you are buying a completed upper from them, it will have already been test fired and checked for headspace at the factory. Unlike many other weapons, the headspace is preset on the barrel and bolt, and taking it apart is NOT going to change anything. It sounds like this is what you were worried about.
I've never heard of any headspacing issues with RRA, and in general, I think your listed setup would work out pretty well. I'm not sure why you would have to disassemble the upper to get it to fit. If your oven is too small, check and see if the upper will fit if placed inside at an angle. There are several times I've had to suspend one end of the upper in the top corner of the oven, while the barrel pointed at a downward angle across to the other side.
If its a close fit, pull the A2 FS off the barrel, and let the threads touch the bottom of the oven. There may be a tiny discoloration on the end of the threads, but you eliminate this when you thread the FS back onto the end of the muzzle.
Its probably also worth noting that the Norrell Moly Resin webpage recommends spraying the finish with a light coat of oil when pulled from the oven.
Parts should be coated in light oil immediately after cured and cooled. The oil will improve the appearance of the dry cured coating and prevent marks, etc. from occurring when handling newly cured parts for assembly.
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Let me know if that helped answer your question, or if I read it wrong.