While Major Kira is showing Ziyal the features of the Federation phaser rifle, she opens and closes the "fully autonomous recharge" component on the bottom of the rifle (heard locking back in to place). A few moments later, it accidentally drops loose when she demonstrates how the rifle is gyro-stabilized by tossing it in her hands.
The Klingons are not suspicious that the Cardassian ship they encountered some distance away has followed them to the same remote location.