They are directly related to the quest “The Replicated Man” and can be found all over the Capital Wasteland. You will get the plasma rifle from Harkness and then can go to the science lab. One option when you agree to help him is gaining permission to kill Dr.
You can get both rewards if you go to Harkness (the android) first and agree to help him. How do you get both rewards in the replicated man?
