DPMS makes a run of them from time-to-time, but they have been spotty on QC - rough chambers, over-gassed, etc.
Wilson Combat just brought out a number of barrel in the .308 sized-calibers this Fall.
But, they (WC) are showing a number the AR-10 barrels with a max length of 18 inches.
I think the biggest trend is to buy an upper, and get the barrel separate to assemble the configuration that you want.
Last edited by AH64guy; 12/11/17.