The lever safety and fire selector ( located on both sides of the receiver ) has four settings : `` S '' - weapon is safe , `` A '' - automatic fire , `` B '' -3 - round burst , `` R '' - semi-automatic mode .
The MAR has four settings : `` S '' - weapon can not fire , `` A '' - automatic fire , `` B '' -3 - round burst , `` R '' - semi-automatic fire .