Black Hole Weaponry barrel. 24" 1-10 twist/SS black shot peened P3/Rifle length gas / threaded 1/2 x 28. Upper receiver with FA and dust cover. Low profile GB and rifle length tube. Mentium FF tube with all the extra hardware included. CH and BCG not included. It cycles fine and is starting to show a liking for 70gr NBT, but I'll be honest. I'm not a fan of the long barrel. I have a grand total of 85 rounds through this barrel so far. buy the whole upper for less than the cost of the barrel. $325 shipped. USPS MO only. Cross posted so timestamp wins.