sometimes that's not enough. people sometimes miss things.
like soaking a bolt in solvent until the pin moves smoothly and not giving it another thought until it jams and you try to extract the round and POP!
you can do everything "right" and there is still that variable with an unproven firearm.
a guy with his first AK might not know 100% what he is supposed to be looking for. looking at pic online and following instructions from people that are supposed to know doesn't really take the place of first hand experience or direct instruction.
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