I have replayed "Gator Bait" two times and from what i've heard is that the 45T is dropped from a body in the warehouse at the end. The only enemy I see that has it is Nelz. You only encounter him when you enter the room and immediately a cutscene plays and ends the mission. I have tried looting the corpses in the warehouse scene, is the gun possibly randomly generated? I'd appreciate any answers/advice.