Bought this gun last year as somewhat of an impulse purchase. Read about it during development and knew HK was a great brand, but mostly purchased this because it was pretty rare. I have several different ARs and have shot many more, but this gun is the most solid, crisp shooting AR I have experienced. You have to shoot it to believe the feel. It is completely solid, and has a beautiful trigger.
I am a die-hard LMT and KAC fan, but I do feel this gun is more solid than either. Never gets dirty, never had a malfunction. It is heavy and does not have many gimmicks, but I think this would be a great gun to have if I ever deployed again.
Also, the magazines from HK are the best made AR mags available. They are heavy, but solid and very reliable. Buy one and see.