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
I would say that most Ryobi One+ tools fall into this category. Cheap and I've never had one fail where I wasn't using it far beyond it's design parameters. Others are more comfortable to use for extended periods, but they are also usually more expensive. That said, there are apparently a few stinkers in their mix, a dust buster style vacuum comes to mind, but I've not run into many.
The tools sure, the batteries, trash.