5.45x39mm is typically pronounced ''five four five by thirty-nine millimeters''. It is also acceptable to pronounce 5.45 ''five point forty-five''.
This caliber may also be known as '''5.45x39.5mm''' or '''5.45mm Kalashnikov'''. In real life, these designations have also been used: '''5.45x39mm WP''' (for [https://en.wikipedia.org/wiki/Warsaw_Pact Warsaw Pact]), '''5.45mm Soviet''', and rarely and in the United Statesonly, '''.21 Genghis''' and '''.215 Russian'''. None of these real-life designations are in use in the Mazes, but are provided here for information.