If you drop a flaregun on the floor, you can then drag a gun onto it to store that gun. Only one gun can be stored in a flaregun at a time. I've tried it with a mp5, a pm74 and a repeater. It seem to take up an attatchment slot because you can still load the flaregun with a flare. To take the gun out i just placed the flaregun back on the floor and dragged the gun to the floor. {F32137}