ArmaLite AR-15
The AR-15 is a semiautomatic rifle that discharges a single shot with each pull of the trigger until empty.  The military version is the M-16, manufactured by Colt Firearms, FNMI, Harrington Richardson, Daewoo, and others. The M16 and M4, unlike the AR-15, is a select fire (semi and fully automatic) magazine fed, gas operated, shoulder fired assault rifle.