Abstract: A fire control lockout assembly restricts a semiautomatic style firearm to single shot operation by requiring specific, sequential manual manipulation of the firearm by the operator prior to firing a subsequent round from the firearm. The lockout assembly has a modified safety selector and a modified disconnector and/or a modified trigger assembly that interrupts the usual automatic progression of the fire control group components after firing the firearm by increasing the upward distance the trigger sear must travel before contacting the disconnector. The increased distance prevents the hammer from automatically being released from the disconnector. The modified safety selector has a barrel that presses downward on the rearward end of the disconnector to release the hammer. After firing a round, the safety selector must be moved to its safe position and then to its fire position in order to fire a subsequent round from the firearm.