UNITED NEWS INTERNATIONAL (UNI) — The U.S. Army’s standard service weapon has a dangerous defect, which can cause it to fire a round without a solider actually pulling the trigger.

The Army recently issued two safety alerts for the M4A1 carbine after a soldier at Fort Knox in Kentucky experienced an unexplained, unintended discharge.

According to a spokesman for U.S. Army Tank-automotive and Armaments Command, the soldier’s M4A1 carbine initially failed to fire when the soldier pulled the trigger because the selector switch was in between “semi” and “auto.”

However, when the selector switch was clicked back into place, the weapon immediately fired.

The Army warned all troops of the problem and asked them to perform a safety check of their weapons.

The Army said at least 881 weapons or roughly ten percent of those checked have exhibited the same problem.