Firearms have been made that use either a clip or a magazine.
A magazine is a part of a firearm that is used to store ammo in until the weapon uses it. A clip, also called a stripper clip, is used to load a magazine. Most semi automatic handguns for example come with two magazines, not two clips.
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We use the term magazine from the french word for storehouse. A magazine "stores" ammunition until ready to be used. It is a much older usage than calling a printed paper periodical book a magazine.
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In addition to stripper clips (For SKS, Enfield, etc.), there are also moon clips (Half and full moon) for revolvers and en bloc clips for the M1 Garand, Lee Rifle, etc.
Unknown.
Magazines and the very few firearms that use clips are used to hold ammunition.
Recommend you try the Gun Broker at gunbroker.com. They have a lot of clips and magazines that come up for older Brownings.
Holes.
Try gun shops, gun shows, pawn shops, want ads, for sale ads, egunparts.
Airsoft guns do not have clips, they have magazines. Clips are a silly cyber gaming term which reveals your noobishness. Use proper terminology.
Magazines can be purchased on line, with a want ad, for sale ad, gun shops, gun shows, pawn shops, estate sales, garage sales, egunparts.
No, you do not need a gun license to buy magazines.
The Heckler & Koch MP5K submachine gun does not utilize clips, but instead has detachable box magazines. They come in 15-and 30-round capacities.
Most paintball guns use an above hopper instead of magazines or clips like firearms. The standard hopper holds 200 rounds. Most magazines for paintball sim-markers are 30 rounds. No paintball guns use clips.
No, it is not legal to purchase gun magazines without a license in California.
No, you do not need a license to purchase gun magazines in most states in the United States.