Khvostov part locations for you Destiny: Rise of Iron Exotic quest hounds.
Destiny: Rise of Iron brings back the Khvostov, the very first gun you find in the first mission of vanilla Destiny.
One step of the Khvostov 7G-0X Exotic quest has you tracking down manual pages and Khvostov parts. The manual pages are random drops in the Plaguelands and you'll have them in no time as long as you shoot stuff, but the Khvostov parts have to be tracked down.
All three Khvostov parts are in the Plaguelands, but just to trick you, they're in remixed Cosmodrome locations. If you don't know how to get to the Rocketyard, Refinery and Dock 13, scroll down to see our directions.
Khvostov part #1
From the Rocketyard, head towards the Refinery - as if you were embarking on the Devil's Lair strike.
Part way along the wall is cut out. Drop down and continue forwards.
You'll come to the first encounter of the Devil's Lair strike, where you have to let Ghost hack some lasers while you hold off enemies. Go through the laser grid door and immediately hug the right wall.
If you're hugging the right wall, you should see the first Khvostov part a few steps through the laser grid door.
Khvostov part #2
Continue through the Refinery towards the area where you fight the Walker during the Devil's Lair strike. As soon as you step into the open yard you'll see a building directly in front of you. Jump onto the roof and cross to the corner opposite you.
The Khvostov part marker should be visible once you get close to the correct corner of the building, but if not, drop onto the shattered metal walkway bit and turn back around to face the way you came; it should be on the right near some ventilation pipes, as shown.
Khvostov part #3
For the next part you need to head to Dock 13. From the Rocketyard, that means passing back into The Divide and then pushing on forwards and right. Go through the corridors till you reach the snowy room where you fought your first boss and got your first ship. Pass through the opposite door, as if you were heading back towards the Steppes (Cosmodrome patrol spawn area).
The Khvostov Part is tucked under the stairs in this back room; the path to the Steppes is sealed, so you can't go past it accidentally.
Return to the Rocketyard from the Plaguelands
Not sure how to reach the Plaguelands versions of Cosmodrome locations? No worries, mate: here's the route.
The Plaguelands patrol spawn is in Lord's Watch. From the starting platform, turn right and head down the road.
Pass the first building on your right but look for a doorway on the second building on your right. Go through.
Follow the corridors, which double back and twist and turn, to come out in the Foundry. You want to cross to the side opposite this entrance.
Here you'll find a door leading back inside the wall. Go in.
Follow the corridors to the end to find this cut in the wall; the Rocketyard is on the other side of this. The arrow shows the direction of the next part.
Hope that helped you track down the Khvostov parts you need to finish that Exotic quest.