Aero Precision so far are my favorite ones. Tolerances are there and the finish has been applied properly and with out defect.
I find the role mark to be simple and aesthetically pleasing, and I like the straight forward nondescript company name. I also enjoy the use of pictograms on the selector position markings.
It is also my understanding Mega Machine lowers are made to very exacting tolerances as well. I do not have experience with them as I prefer the 'A' on the Aero lower Vs. the Atom Sign thing on the mega lower. It always makes me think of Homer Simpson at the Nuclear plant for some weird reason.



... If you don't want a particular rollmark, here's a link to Aero Precision for $60 (they also have blem Aero lowers for $55). Free shipping over $100. 
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