While the rimfire cartridge was popular at one time, and there were more than 50 different rimfire cartridges, in different calibers, ranging from 2mm (about .08 caliber) to larger than .56 caliber. Today there are only about 7 different rimfire calibers still being loaded- the 17, 17 HMR, the .22 Short. Long, Long Rifle, the .22 WRF, and the .22 WMR. As far as different makes and models of rimfire rifles, there have been THOUSANDS of different rifles.
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There are only slightly fewer different AR rifles than there are AR rifle owners.
The AR platform is modular and there is a large number of manufacturers making parts and accessories for it. This means that a user can customize the rifle to his or her own preferences, and so everyone's rifle will be a little different.
The number of AR rifle owners is just marginally smaller than the number of different AR firearms. Since the AR platform is modular, several different companies produce its elements and add-ons. This implies that a user can modify the gun according to his or her personal preferences, making each user's rifle unique.