Noveske did a run on them a few months back. As far as I know, no one else is doing productions on them. Everyone I know that has a 6.5 has gotten a blank turned and chambered by a smith.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: koz</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Redmanss</div><div class="ubbcode-body">He's asking about 6mm, not 6.5mm Creedmoor.
OP, I'd have to say that with the lack of available factory ammo right now, they'll be only available via custom for some time. </div></div>
CopperCreek is producing 6mm CM with Hornady Brass.
http://coppercreekammo.com/index.php?main_page=index&cPath=47</div></div> But until Hornady comes out with factory loads in it, I don't think you're going to see Noveske, DPMS, Rainier, or any of the other major manufacturers turning out barrels on a regular basis. It's hard enough finding quality large frame AR barrels in anything other than .308 as it is.
OP, if you're wanting to shoot the 6mm Creedmoor, just call GAP. George even said he's going to be running a group buy on GAP-10 uppers in 6mm CM soon. Keep your eyes open.