A top cover and safing blade assembly replaces the prior art top cover and safing sector in 7.62 miniguns. The top cover and aft camming portion of a longitudinal helical track are combined in a single unit, thus permitting the forward camming portion of the helical track, incorporated in the safing blade, to be removed separately. Safing the gun by opening the safing blade and rearming it by closing the safing blade can be accomplished in far less time than is required in prior art safing systems. Live cartridges can be quickly cleared from the minigun by electrically rotating the barrels after the safing blade has been locked in its open position.