Ordered my carbon fiber direct from Proof Research and waited months on it. In all likelihood mine is going back for them to repair/replace since it has a 1 MIL drop on the first cold bore round. Saturday I shot 50 rounds at 75 yards (fire 10 rounds, reload the mag, fire another 10...) and the last 10 rounds had shifted up another 2/10ths of a MIL as the barrel warmed up. In a NRL22 match the barrel has time to cool between stages so that's not an issue for me. But the cold bore accuracy is a problem.