Yes.
"The BATFE recently released U.S. firearm manufacturer production data showing that during 2008, AR-15s accounted for eight percent of all firearms and 22 percent of all rifles made in the U.S. and not exported. The number of AR-15s in 2008 -- over 337,000 -- is staggering, but may have been topped in 2009. And, at the current rate of production, the total number of AR-15s in the U.S. will exceed 2.5 million some time this year..."
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's-collapsing-here-ar-15-ownersh.aspx Two firms that make AR-15 type rifles (that I know of), Smith & Wesson and Rugers, have both announced they are running three shifts on their production lines (24/7). Rugers has even announced they are not accepting new orders because of the backlog.