If I'm not mistaken Boots give Kreiger his rights to the 5R
Guys at Bartlerin worked for Kreiger also have right 5R. Brux,old owner Rock Creek barrels worked for Boots. When Tim North purchased Broughton barrels he made 5R and he got call from Boots as he owns right for 5R and name was change to 5c. Kriger,Bartlein,Burx,Rock Creek are close to Boots same state. I'm sure there are others that worked for Boots.