Re: Best AR-10 barrel manufacturers...
There are as many barrels for AR10's as there are for any bolt gun. It's just a matter of getting a smith to install the barrel extension, drill the gas port and chamber it.
If you want to just buy and install then Armalite, Krieger and Noveske are your primary options.
I have a Noveske on mine and it works fine.
If you want as accurate as possible, then just send your bolt to GAP.