My 10 round magazine takes one clip. a 20 round takes two clips, and a thirty round takes three clips.
You use a clip to quickly load a magazine for the AR-15. Make sure you don’t loose the adapter for the clip or you will then have to break apart your ammo and load it one at a time in the magazine till full.
The M-1 carbine clip has the adapter made into the clip for it’s magazine.
YES, the 5.56 and .30 carbine does come in a clip of 10 rounds. I have quite a few.
I know. I’m being facetious.