On the other hand, I went to Hart for a custom prefit barrel to fit my Colt M-4 Carbine. I wanted a heavy 24" 1:9" twist barrel chambered for .204 Ruger, but made without a gas port. The idea was to build a straight-pull bolt action varmint rifle that didn't scatter brass all over the landscape. Hart listened to my idea, made some recommendations and produced exactly what I wanted. They were the only barrel maker that would make what I needed (everybody else probably thought I was goofy). Took awhile, but seems to work. Every other Hart barrel I have has been a good shooter.
Ten shot group below, with two moron jerks on the trigger, show the barrel is good. Not bad for a tiny 24 grain lead free bullet dinking along at 3,900 +/- fps.