Never noticed the difference in AR upper alignments before, notice the upper on the Barrett AR and the upper on the HK AR. HK matches up perfect. I know its just aesthetics but with high dollar guns details should matter.
Oh I'm sure either of these AR's will perform fine with out issues. Now that I spotted the mis-match I have seen many other misaligned uppers in AR pictures too, like on Colt and others. Must be just typical for the most part. But I think if you go high dollar on any product, detail and alignments of parts should be expected....like what HK did on theirs. The Barrett is far from a low end AR...