The Marine Corps also uses the M4 carbine, but the service said in ... The glitch-testing started when a Fort Knox soldier's M4A1 selector switch became stuck in-between the semi and auto settings.

In March, according to Stars and Stripes, a soldier recorded cellphone video of his M4A1 carbine discharging a round after the selector switch was ... warning to older M4 carbines, M16A2, M16A3 ...

involving an M4 that had been converted to an M4A1 through the product improvement program, or PIP, according to the safety messages. "The operator pulled the trigger with the selector switch ...

The Marine Corps announced Oct. 26 that the M4 carbine will officially replace the M16A4 as the universal rifle for the infantry. Commandant Gen. Robert Neller approved the switch, making the ...

Both the Army and Marine Corps are checking their M4 carbines and M16 rifles for a malfunction with the selector switch that causes ... where a soldier’s M4A1 carbine went off unexpectedly ...

WASHINGTON (Army News Service, June 16, 2013) -- Soldiers will continue to use the M4 carbine or improved ... and also provides an ambidextrous selector switch that allows fully automatic ...