If there was a good dependable AR that weighed in under 5 lbs, I'd have one.
But there are certain things I won't settle for and the carbon/plastic guns are not for me. As to John Burns' carbon 15, I've seen too many of those have problems when a friend used to sell them way before BM bought them out. John is lucky he found a good one.
But if sub 5 lbs is the goal, I'd look at a Contender carbine in 223 and start drilling holes and scrapping anything non essential.
