AK-47

Not in any way to condone the production of these, but it's the 90th birthday of its designer, Kalashnikova. He received no royalties. It has endured as the VW Beetle of weapons, with 100 million sold, because it is so well and simply designed. It is idiot-proof, obviously a valuable criterion for amateur militia use.

Its name? A(vtomat, meaning automatic) K(alashnikova) (19)47

(I'm guessing all but a few dozen of its owners know the root of that infamous name)