I am not a big fan of pre-fit barrels for many reasons. They can be good or they can be bad. If you get a good one then you are lucky, If you get a not so good one you haven't saved any money and get what you get. Pre fit barrels are mass produced and do not have any allowances for discrepancies that may be present in your action. Things that a good smith can anticipate.
Pre fit barrels are a lot like stocks that don't need bedding and are advertised as drop in. (One size fits all) There is more to installing a pre fit barrel than head spacing it. Not knocking the pre fit barrel makers just the concept of them trying to get proper thread fit, alignment to your action, proper torque, ETC.
By the time you buy a pre fit barrel, you have paid for a barrel, gun smithing, and you need proper tools to install correctly and buy this time you have spent almost as much as you would have buy using a smith, without the advantage of experience and expertise furnished buy the smith.
There are many top quality barrel makers that sell there premium barrel blanks for much less than most pre fits. of the many pre fits that I have repaired, None used the top quality barrels because of the price of the pre fit. This is especially true in the AR platform. when you can buy a complete upper for less than $400.00 how can they use a $400.00 dollar
barrel. (They don't).
Like everything else, you get what you pay for. recommendations normally come from those that have had good luck with a particular brand, but not from those that have not had good luck and probably quietly sold there pre fits and road of into the sunset licking there wounds and absorbing there loses.
I know it sounds negative but it is just a warning that you get what you pay for.
Just my opinion
J E CUSTOM