I'd go with a 6920 if you have to have a fully built gun.
If you're not opposed to buying a complete lower (BCM, Colt, LMT) and a separate upper, BCM complete uppers can't be beat.
All of my ARs are factory Colt lowers with BCM uppers.
A lightweight 14.5" mid-length with a Battle Comp is about the softest shooting AR out there and is going to as light as possible.
I'm a Colt fanboy, but BCM just has better uppers when you want more than a Mil-Spec.
"If you're not shootin', you should be loadin'. If you're not loadin', you should be movin', if you're not movin', someone's gonna cut your head off and put it on a stick." -Clint Smith
Last edited by samuse; 09-11-2012 at 09:48..