Dear Sir,
Thank you for contacting Remington! Your service ticket number for this repair is xxxxxx. We are still awaiting the replacement for your R51. We do not have an estimated time arrival for the replacement. When we have that then your repair will be complete and you receive your firearm.
Thank you and best regards,
Remington Customer Services
Good to hear they are still going to replace it. Bad to hear "We have no idea when it will happen"