Got this from another member: AR10 T Custom Kreiger 26" SS Medesha Upper, the barrel is Heavy with .920" diameter, I decided to go a different route, I am second owner and have not shot it, the first owner said he put 600 rnds through it and said .5" groups with match ammo, I looked at the rifling through a bore scope and think it was more like 200 rnd, very little copper fouling.
This upper does not include a bolt/carrier/charging handle, though the bolt headspace is tight, I have the bolt that fits this barrel , there is a 50% chance your bolt will fit, but in case it does not I am willing to swap bolts.
The marks on the end of the barrel are indeed scratches but it is all cosmetic and does not effect the function or accuracy of the barrel, no , I did not caused it and the price of the upper reflects this. Also the front receiver lug has fitting studs to make the upper to lower a tighter fit. This upper was made by Medesha Firearms www.medeshafirearms.com/Matchrifle.0.html
the free float tube has a rail slot for adjustable bipod attachment, you can get this attachment peice from Brownells to fit your Harris Bipod.
Cost of upper if bought new are as follows:
Keiger custom 26" Match 30cal barrel +$600
Armalite upper +$350
DPMS Gas Block/w tube $70
Medesha gunsmithing and custom free float tube $500
I am selling for $690 (this is what I bougth it for) and I decided to go another route (Will ship for an additional $20 and you take a chance on the bolt)
if interested please contact at firstname.lastname@example.org
I prefer a face to face so that we can test your bolt to make sure it fits.
Trades of interests at this time is a LMT MRP upper