For me, it’s my old Remington 700, its been with me through hunts and rough weather. No matter what else I trade or upgrade, that rifle ain't going anywhere.
The 1831 Springfield rifled musket is a family heirloom. Dads grandmother handed it over with the comment "I've been hauling this damned thing around for years, its your turn now" . It's very possible the gun was at Gettyburg because the great grandfather's 148th Penn. Volunteer Regiment was there.
Well I have a few that I will never sell, but if I had to pick one. My dad’s Ruger Super Blackhawk in 44 magnum would be the last one out the door. He bought it back in September 1970.
As a young man I had to sell my guns to pay tuition, i kind of promised my self that if i ever rebuilt my collection I wouldn't sell any. So far I've stuck to that (I'm 77 now). My guns will be handed down to grandkids and they can do as they see fit.