on hotbar switch:
    if player's tool is set:
        if the name of the held item contains "M134":
            set the player's walk speed to 0.14
        else:
            set the player's walk speed to 0.2

on hotbar switch:
    if player's tool is set:
        if the name of the held item contains "AK-47":
            set the player's walk speed to 0.14
        else:
            set the player's walk speed to 0.2