In my previous life as a soldier, I saw more than one centerfire rifle bore cleaned with a knotted boot lace and some motor oil.

Generally said rifle was an AK-47 or AK-74 (Yes there is a 74, and there is a difference.) or maybe a RPK. Generally the weapon's operator spoke Farsi, Urdu, Pashtun, or Central American Spanish.

May have been ugly, but the darn things always went BANG.
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I do the things that I must, and really regret, are unfortunately necessary.

RIP OBG