Guys, the man wants a reliable rifle-length AR-15. He's even been gracious enough to specify its uses. If you aren't posting examples of reliable rifle-length AR-15s for his stated uses then seriously consider whether these ridiculous arguments about the "lowest bidder" and the "terribly unreliable AR-15" that we've had before, often, need to be rehashed again. For those who brought these up, I invite you to use the Search feature and read those previous arguments.
Cat-O-Matic: respectfully, you are mistaken. The weapons were not the issue at Wanat.