5.45 x 39 mm M74 Guide, Meaning , Facts, Information and Description
The Soviet 5.45 × 39 mm round was introduced into service in 1974 in the AK-74 assault rifle, an updated version of the AK-47. The round, which replaced the 7.62 × 39 mm; round then in Soviet service, was likely developed based on Soviet observation of the American 5.56 × 45 mm; round in Vietnam.
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