First, remove the magazine cap. The A5 features the unique TurnKey Magazine Plug which is quickly and easily removed by inserting a key or standard screwdriver into the slot in the end of the magazine tube. To remove the three shot adapter (plug), press inward and turn the key or flat blade screwdriver a quarter turn to align the three shot adapter (plug) with the slot in the end of the magazine. This unlocks the three shot adapter allowing it to be removed.