Here is the warranty information copied from a Ruger pistol owner's manual.
"WHY NO WARRANTY CARD HAS BEEN PACKED WITH THIS NEW RUGER FIREARM
The Magnuson-Moss Act (Public Law 93-637)does not require any seller or manufacturer of a consumer product to give a written warranty. It does provide that if a written warranty is given, it must be designated as “limited” or as “full” and sets minimum standards for a “full” warranty. Sturm, Ruger & Company, Inc. has elected not to provide any written warranty, either “limited” or “full”,rather than to attempt to comply with the provisions of the Magnuson-Moss Act and the regulations issued thereunder. There are
certain implied warranties under state law with respect to sales of consumer goods. As the extent and interpretation of these implied warranties varies from state to state, you should refer to your state statutes. Sturm, Ruger & Company wishes to assure its customers of its continued interest in providing service to owners of Ruger firearms."
I realize that it doesn't really speak to transferability of the warranty, perhaps a call to Ruger, or a review of your specific state's warranty statutes are necessary in order to answer your question. Perhaps other forum members have additional comments.
HTH,
boomer