This is a very nice .44m rifle, you can find it in the museum of history, when you first enter, go straight into the huge room with the mammoth in it, and turn left, you'll c a door, enter it, but b4 u do, u might want a machine gun, and a .32 rifle, theres alot of feral ghouls and glowing ones down there, so bring alot of ammo. when you enter the door you'll c sum stairs, after u kill all the ghouls, go up them and you'll c wat looks like a lunch room, go left and down the hall, you'll come up to hole in the wall, enter it and turn right, its in the display case. have fun with it.