I just traded for this upper and it shoots great. It averages under 2" with IMI, and will do just over and inch with Winchester 45gr HP's from Wally World. Standard flat top FN upper, with a Colt 1/7 chrome lined barrel and Hogue free float forend. Barrel was professionally cut and crowned to 19" to remove the threads. Right now it has the standard front sight tower, but I am in the process of installing a set screw shaved gas block. However, the original FSB will be included. .750" at the FSB, and light under the handguards.
I will post pics once the new gas block is installed. I do have pics of the upper as it is now, and will email to those interested.
I really would prefer to trade this upper for a bolt .223 rifle, preferrably a Savage 10FP w/ accutrigger or Remington 700. However, I will consider any bull barrel bolt gun. I can include a complete lower for the right deal. I will also consider swapping the upper for a 20-24" full bull upper, with stainless barrel and 1/7-1/9 twist.
$375 ($450 with B/C/CH) *package deal only*
I will consider parting out the barrel, etc.