For that price it'd be hard to go wrong I would think. I have one of the old Professional Ordinance Carbon 15 uppers on a DPMS lower and it works extremely well. All I did was upgrade the bolt and drop a match trigger in the lower. It's been very effective at the practical rifle matches I use it in.
Have you ever gotten it hot enough that you worry about the upper, particularly the receiver threads? I have been thinking about making a really light weight gun but I make my AR glow as a matter of routine.
Rob
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