You need to make an armature. Put the base of it where you want the gun to shoot from. Go into edit mode with the bone selected, select all, and on the materials screen change the one that was BO:Bone to BO:muzzlepoint
Then, make 2 empties. Name one of them detail32 and the other one shape. Parent all of your weapon to detail32 and then parent detail32 to shape.
Export using dts exporter.