With Aero lower I agree with GH41, go mil-spec. If you go with a matched upper / lower billet set from a good manufacturer, you may have a slight edge but the question is, would it be enough to make a noticeable difference? Possibly. I've used billet uppers from a number of manufacturers and found that there is some variability between them and also some don't play well with certain other brands - so mix and match may or may not work depending on luck of the draw.
Regarding facing, do a forum search. It's been discussed here a number of times. I can't comment on bedding the receiver extension into the upper. Never done it and don't know anyone who has.
I predict future happiness for Americans, if they can prevent the government from wasting the labors of the people under the pretense of taking care of them.
Thomas Jefferson
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