Well the way I see it, he's already spent his money. It's just a little late to do any research on it. Just go out and shoot it. Go out and get some trigger time, figure it out a bit, form an opinion. Too much thinking and not enough doing makes Johnny a dull boy.
Q does bring up a good point, if your dissatisfied with your barrel or upper, it'd probably be better to just sell it complete and buy another one. You'd probably lose a bit less that way.
Assumption is the mother of all ****ups.
Know what you know, Know what you don't know. -Paul Pedzolt
"Jack of all trades, master of none, though oftentimes better than master of one" -Mynshul