It must be worth having a thread of current warranty periods and comment for the multi-various brands of scopes in use with SD members ; the well known and the less well known.
I've been using recently :
Bushnell, limited lifetime
Nikon, full lifetime (non-electronic component scopes)
Schimdt & Bender, 30 years
Optima, can't remember if there ever was one, 35 years on still in perfect working order.
There must be a score or more makes in current use. S