Almost all Wilson’s troopers carried seven-shot Spencer breech-loading carbines. Source: Internet
Despite being marked as 'non-military items,' the shipment comprised 1,800 Benelli 12 gauge shotguns, 7,500 semi-automatic Beretta Px4 Storm pistols, and 1,900 cal 9xI9mm Beretta Cx4 Storm semi-automatic carbines. Source: Internet
As long guns, pistol-caliber carbines may be less legally restricted than handguns in some jurisdictions. Source: Internet
It is also worth noting that Arnold Schwarzenegger, though restricted to paltry carbines and sharpened sticks in Predator, rocked a similar system in Terminator 2: Judgement Day as an effective anti-aircraft weapon. Source: Internet
Conversely, many rifles have barrels shorter than 20", yet aren't considered carbines. Source: Internet
Development of lighter assault rifles continued, matched by developments in even lighter carbines. Source: Internet