This is not a conversation about guns. This is a conversation about items that have withstood abuse that are near unbreakable.
Some items I have heard referenced as AK47 of:
Gerber MP600: It’s a multi tool
Old Thinkpad Laptops
Mag lights
Toyota Hilux
In that case, it’s probably any gasket that’s susceptible to this, coffee is really strong-smelling. My Zojirushi thermos is only used for coffee, for this reason…