I don't own a carbon lower, so I'm only stating what I've read on the NET (so take it for what it's worth), but I've read that people have been using carbon lowers to mate with .22LR uppers. In that capacity, I think it's a good idea, but for a .223/5.56 weapon, I don't think the minimal cost savings on the lower would be worth it. That's MHO. -TomT
