20" flat-top Model 1 upper receiver. The receiver has the "T" numbers and has a very dark finish. The 20" barrel measures .875" under the handguards and .725" within an inch of the muzzle.
The barrel is a 1/9 twist and I suspect is not chrome-plated. I don't know whether it is a .223 or 5.56. I have only put about 40 rounds through it but they functioned fine. The previous owner said that it had only about 800-1000 rds through it when I bought it.
The only scuffs on it are on the brass deflector (where the brass contacts it), where the charging handle meets the upper (normal wear mark), and there are two little specks between the ridges on the mount on top of the receiver (about the size of a grain of salt).
The only reason that I am selling it is that it is a lot darker than my RRA lower receiver and I am kind of picky.
I should have some pictures available later.
I'll even throw in a Norinco 3-9x40 rubber-coated scope with rings with the deal.
$240 shipped with confirmation and insurance included. If you want to do Paypal, I will split the fees with you (1.5% to both of us.)