A .50 caliber M2 machine gun: John Browning's design haes been ane o the langest servin an maist successfu machine gun designs

A machine gun is a fully automatic moontit or portable fireairm designed tae fire bullets in quick succession frae an ammunition belt or magazine, teepically at a rate o 300 to 1800 roonds per minute. Note that nae aw fully automatic fireairms are machine guns.