I don't have exactly the same setup, but my carbine is built from a PSA kit using a PSA lower. I've put about 3k rounds through since it was built almost two years ago and after a couple of teething problems were taken care of, it's run fine since. At first, the rifle would occasionally have a feed jam because the upper receiver was cut with M4 feed ramps and the barrel was not. PSA took it back and repaired the problem in a most timely fashion.
The FN barrels are among the best available for the AR. You may get sub MOA accuracy with good ammo, but you won't know until you try. A reasonable expectation is 2-3 MOA with bulk, blaster ammo.
A good acquaintance of mine built a couple of PSA kits and he's been satisfied with them as well. I like my PSA and wouldn't hesitate to buy another or three. Assemble your PSA kit correctly and it will be a good running carbine
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