This walkthrough will help you find Hudson's Pulse Rifle, a legendary pulse rifle in Aliens: Colonial Marines
1) You have to be in the mission The Raven - This it the fifth mission of the game, it's the mission right after No Hope in Hadley's
2) You have just found and rode the elevator out of the Sewers (That was the place where you encountered the "Boilers", or exploding aliens):
3) Pick up the Duffel Bag from where O'Neal is, and get your equipment back:
4) O'Neal will open a door that has a keypad to the left:
5) Go through that door and continur straight through another open door:
6) Hudson's Pulse Rifle will be in a small room on the floor to your right amongst some rubble, near a white desk:
Enjoy your new legendary pulse Rifle.
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