I agree with David D.. TC can offer many chambers, but that's where it ends. They, to my knowledge, don't give many, if any, options in counter, length, twist, chamber/throat depth, etc. These options would be the difference between a "custom" barrel, and an "optional" chambering IMO. No doubt there are more accurate barrels from TC than inaccurate. But that's all relative to the shooter as well. My 2 cents.