I use the word clip because that is what we used to call them in the old days and have not changed my terminology. I served in the army from 1965 to 1968. The army was just changing from the M14 to the M16. I qualified with both. I only qualified as a sharp shooter. Later when I was assigned to 24th infantry division I was assigned to a machine gun crew and qualified with an M60 machine gun. My MOS was aircraft electrician but when you are assigned to an infantry division you are an infantry men first and a aircraft electrician second.
At that time no body took the time to call a clip a magazine. It took too long to say if you needed one in a hurry. But that was real life in the army at that time. My brother was in the army at the same time in Vietnam and I was in Germany. In Vietnam they sure did't take the time to call a clip a magazine in the heat of a fire fight but that is real life in war.
He was a door gunner on a Huey.