Looks like an AR15 style pistol caliber, probably 9mm, .40 caliber, or .45 cal. It appears to have a red dot sight, but the young woman never seems to use it. Looks like an AR15 style pistol caliber, probably 9mm, .40 caliber, or .45 cal. It appears to have a red dot sight, but the young woman never seems to use it.Who needs a 30 round magazine according to the gun grabbing zealots, this video is a perfect example of where large capacity magazines might have saved her life.