Both the Finnish 7.62 KvKK 62 (the now mostly retired light machinegun in 7.62x39) and PKM are, in skilled hands, capable of squeezing off single rounds. The KvKK is the easier one, though it has a very high rate of fire on cyclic. The PKM requires even lighter squeeze for single shots, but it's still feasible.
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"Listen to me, nugget, and listen good. Don't go poppin' your head out like that, unless you want it shot off. And if you do get it shot off, make sure you're dead, because if you ain't, guess who's gotta drag your sorry ass off the field? Were short on everything, so the only painkiller I have comes in 9mm doses. Now get the hell out of my foxhole!" - an unknown medic somewhere, 2013.
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