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 Shure SM52 microphone (it used to be called the 58 but lost 6 due to budget cuts or something I dunno)
You might not have heard of it, but if you've been to a live gig, chances are you've seen one
And the SM57 for things you don't need a screen on.