I guess heirloom is a pretty broad term as alluded to by a poster. I would consider a pristine JC Higgins Model 50 to be an heirloom. A Mark X Interarms is very nice. Can’t beat a FN Commercial Mauser action, a Husqvarna or even an older Zastava. The older Zastava CRF actions seem to have much better fit and finish than newer ones. I forgot Safari Grade Brownings(FN). If buying new I’d be pleased as punch with a Winchester or Montana. Getting back to heirloom having broad parameters, the 700 ADL I bought in 1972 is considered an heirloom by myself and my son.