Another option might be Manns Sporting Goods at 515 W Water St, Pinckneyville, IL 62274. Phone (618) 357-2911, at one time Manns was an authorized Remington Repair center. A Friend (FFL) has used Manns several times to get shotguns repaired. One was a State Police 12 gauge Remington 1100 modified by Sage Int. with a collapsable stock. Sage modified Remington shotguns for LE/Military use back in the 70s/80s.
Looks like Mann sold his business to an employee in 2017. Mann retired but the new owner is a gunsmith and might still be a Remington Premier authorized service center. Here is a link to Mann SG FB page.
https://www.facebook.com/42617manns/?ref=page_internal
If you do a search there a couple of news articles on Manns retirement in 2017.
Looks like Mann sold his business to an employee in 2017. Mann retired but the new owner is a gunsmith and might still be a Remington Premier authorized service center. Here is a link to Mann SG FB page.
https://www.facebook.com/42617manns/?ref=page_internal
If you do a search there a couple of news articles on Manns retirement in 2017.