Criterion (CBI) barrels are great. I have one in 6BR and a buddy got one in 243AI. Both shoot great and clean easy. Mine shoots so good that I have gotten bored with it and I don't shoot it as often as I should.

Another place to check would be with Jim at Apache Gunworks and see what he can build for you. My last 3 barrels have come from him and my next one that I am getting ready to build will be ordered from him as well. Apache makes some great shooting barrels.