It's a cool looking rifle, and light too.
I have never held on in my hands, but given that it has a thin barrel, it is same to assume that it will heat quicker than a thicker barrel. However, given that you are talking about a .223 which has, relatively speaking, a small amount of powder, I wouldn't worry about the barrel overheating on 2 or 3 rapid shots. Now, if it was a .270 or so, then the barrel rise in temperature would be more noticeable.
Zachary