I have a POF USA P416 14.5" complete upper with POF front sight. 1 x 8 twist. Used. I am guessing somewhere between 2k and 3k rounds through it. I am pricing it at $950 shipped to you CONUS. Paypal or USPS Money Order. All NFA rules apply.
Edit: After realizing I didn't have this upper when I first got my M16, i would revise my estimated round count to around 1,500.