Armalite has what you're looking for.
Hmm..thanks for the tip. The only ARs I’ve ever seen have been in 5.56 or 7.62.
"Armalite has what you're looking for."
Yep, they do and a fine caliber it is. Unfortunately it will take a long time to get one unless you are lucky and want to pay the premium price at a gun show. I ordered a flat top match barrel upper from Armalite for my AR-10 last December. When can I expect delivery I asked? How about November of 2013.