I have a very nice and rare upper for sale.
It's a 100% Colt 10.5" M4 Upper. It has the REAL M4 feedramps and "M4" stamped on the front/top of the upper.
Barrel is chrome lined, 1/7 twist, 4150 steel, MP test....the best you can buy. It's no ban and has a threaded barrel and a bayo lug FSB.
The flash hider is a very rare and original Knight's Armament Quick Detach FH. It is designed so a suppressor can be taken on and off easily.
The FSB is marked "F" and date on barrel is 06/04, a very new upper.
Includes M4 BLACK handgaurds, not the green ones pictured. Also includes COLT Charging Handle. This is a small hole Colt so it will fit almost all lowers.
This Upper was NOT used on a machine gun. It only has less then 100 rounds through it.