I asked Ruger if they would rebarrel my LH 375Ruger Guide Gun with a 416Ruger barrel and they said, "NO".
Way to go Ruger. Stellar customer service. Hence my love hate view of Ruger. They just want to sell everyone Ruger American rifles and crappy plastic pocket pistols. I suspose that pays the bills but truth is they probably don't have anyone working anything but scheduled production line.