Both the Army and Marine Corps are checking their M4 carbines and M16 rifles for a malfunction with the selector switch that causes the weapons to fire without soldiers or Marines pulling the trigger.

U.S. Army weapons officials have figured out the cause and ginned up a fix for a dangerous glitch in the selector switch of M4 and M4A1 carbines that could cause the weapon to fire unintentionally. In ...

The Army is investigating why some of its M4A1s are firing while the selector switch is between SEMI and AUTO without pulling the trigger. (Army) The Army is investigating after an unintentional ...

U.S. Army units have reported about 3,000 M4 carbines have failed a safety inspection because of a potential glitch in the selector switch that could lead to unintended discharges, Military.com has ...