I have a Colt 6920 and am considering making it into an 10.5 inch SBR. I have looked around and found uppers with the barrel for $600 to $700. However, two different places I went to advised that for about $80 to $150 I could have the current barrel cut and re-threaded and it would be as good as new. They said may pros go this route and even provided me with gunsmiths that specialize in this type of work. Since I have no idea, I trust you ladies and gentlemen that do know will guide me in the right direction. Thanks in advance for any help.