I have a Colt barreled flat top upper (small hole). It is a 20 in. chrome lined hbar 1/7 twist with the thin profile under hand gaurds. It has had less than a 100 rds. through it. It has a four rail free float on it and an Armalite gas block. The rails have a few nicks on them but nothing too much. No bolt or charging handle. I can email you pictures.
I would like to recieve a "ban free" 5.56 or 9mm 16 in. CAR or M4 upper flat top or A2, preferably a Rock River Arms. Thanks for looking.