Rifle or Carbine Action: Single-shot, repeating, semi-automatic or fully automatic. A rifle is defined, in part, as a weapon designed or redesigned, made or remade, and intended to be fired from the shoulder and designed or redesigned and made or remade to use the energy of the explosive in a fixed cartridge to fire only a single projectile through a rifled bore for each single pull of the trigger.Despite initial shortcomings, however, the M16 remains in American military service to this day, and it is the most produced rifle in its caliber. The AR 12 shotgun is semi-auto, gas operated shotgun that loos and functions like an AR15 rifle. AR12 Shotguns are designed to be a multi-purpose that will fill the need of tactical, home defense, hunting and sporting customers. examples of rifles Model 1873 Colt Single Action Army. Springfield 1903. 1911 Pistol. Browning M2. M1 Garand. AR-15. Remington Model 870. M1 Carbine.Calibers. The AR-15 is nominally chambered in .223 Remington or 5.56×45mm NATO, with the .223 Wylde chamber allowing for the safe chambering of both, but many variants have been produced in different calibers such as .22 LR, 7.62×39mm, 9×19mm Parabellum, 6.5mm Grendel, and shotgun calibers.The AK-47 shoots a 7.62x39mm caliber that penetrates and damages its intended target greater than the caliber shot from an AR-15. With this larger caliber, the AK-47 has greater "stopping power" than the 5.56/. 223 round of the AR-15.