Blueprint - Go into the Weapons Lab and pick up the Rai K-84 blueprint off the wall.
Eyeball - Go over to the Scorched Defense and to the tank there will be a body which you can interact with to get the eye.
Locker Key - Go back into the Weapons Lab and go to the computer and interact with it to get a key. Now go into the barracks and open all the lockers next to all the beds. There are 9 total lockers. These will spawn mimics and one of them will drop a part.
Dartboard - Go back to the computers in the Weapons Lab and interact with it. Now watch the screen and watch until the moving slice in the circle stops and remeber where it stops. Then look at where it stops the next two times and in which order. Go into the room with the Wunderfizz machine and go over to the dartboard. Shoot the three spots that the slice stopped at in order that they stopped. Once you shoot those three shoot the red dot in the middle. If done correctly the dartboard will open up and you can pick up the part.
Mangler - Wait for a Mangler to spawn in and kill it by shooting it arm with the blaster. Now you can pick up the part it drops.
Power Cell - Go into the weapons lab and interact with the table right next to the armor stand. Now complete the round your on and the next round and the power cell will be all charged up.
Craft - Go over to the workbench where the blueprint was and start crafting the Rai K-84