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
The original Japanese Boss HM-2 (1983-1988). Nasty, indestructible, cheap (at the time) and still in use today. There are death metal band out there still using a forty year old pedal.