What are you wanting to end up with, an M4 clone type with a front sight base, or something free-floated? If it is the former, IMO you cant go wrong with this set-up:
http://palmettostatearmory.com/psa-1...ng-handle.html
I have this upper, because, well, FN (I thought) barreled upper for $159.00, I couldn't pass it up. It is a tack driver.
Another question, are you building the upper yourself, having a buddy do it, or paying someone to do it? I would not pay someone to install that particular barrel, no reviews, PSA is relatively new to making barrels, etc.
For something I'm building myself I might chance it. If it isn't working - functionally or accuracy-wise - I'll send it back. If you paid someone to build it, you'd would them be on the hook for the labor of uninstall and reinstall.
I have not had any problems with PSA's order fulfillment or shipping, I've never returned anything to them so I can't speak to their return policy.
Have fun!
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