Why do you insist on using the word clip as a short for magazine? Despite your in depth research. Anyone trained in use of firearms will use Mag as a short/ nickname. Even those mildly trained in armed security. The room on a ship or locker holding any type of ammunition is referred to as a magazine as well. Hence the use of " I am out... you got an extra Mag?" "I will meet you in the magazine. ". I had to ask this.