You are comparing apples to hand grenades at this point in time with your analogy. Saying that a barrel is a "match barrel" has many different connotations to different people and many mfg's use that term VERY losely indeed. If you can be more specific as to what mfg's barrel you just purchased, including what model, etc....then it is possible that someone here can give you some decent information, but as it stands now...it'd be pure speculation. Also, just as a future warning...it helps a hell of a lot if you ASK THESE TYPES OF QUESTIONS BEFORE YOU PLACE AN ORDER!!!
Additionally, and since you didn't say I'll just throw it out there...one of the biggest issues with a "match barrel" for an AR is the inclusion of a matched, properly headspaced bolt. Just one more thing to consider...