M-4 carbines....

I used to deal a lot with anodizing aluminum motorcycle parts. It's basically controlled oxidation where dye are embedded in the oxide coating that all aluminum forms on its surface. It never chips but can get scratched off with a lot of work. I wouldn't call the finish pourous but on most pieces, a light oil like WD40 can really deepen the color and shine it up.
 
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Thanks IamI - how tight is the lower to the upper? I handled one in a local store and it was quite loose.
I am very close to placing my order :)
 
Looks pretty good to me for $500. Other dealers are selling uppers only for the same price....crazy
 
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