Full-Auto Shotgun

[Melchiah]

Ok so I'm having trouble finding the last part of this damn thing; I have 3 out of 4 parts, and after searching for a while I couldn't find any guide to get that last part.

There's a post where someone suggested this site[www.gamersheroes.com], but it only points at three parts, which are the ones I already have (and there's even a comment saying it requires four parts, and the guide is missing the last one); anyone knows where is it?.

[Jay]

http://www.usgamer.net/articles/rise-of-the-tomb-raider-the-rescue-save-jonah-path-of-the-deathless-the-divine-source

Have you got that one? it's right at the end of the main story, I haven't been that far yet so I don't know if it's the one or not.

[Melchiah]

I've already saved Jonah, and I stopped right at the Geothermal Valley (cont.); I don't want to keep going because it feels like the end game, kind of like the final rescue on the previous game.

[Jay]

Ok, sorry, I tried searching myself and I could only find the first 3 and that site. I looked on countless sites as well and still nothing.

Edit: Just found that but they don't speak so it might not be much help.

https://www.youtube.com/watch?v=fujeU43XpzI

[Melchiah]

I finally found it, it's on the weather station base camp, due east.
http://steamcommunity.com/sharedfiles/filedetails/?id=1179254560

[Lost-it-Bad]

in cave in soviet installation behind tower across the creek with flag on top need explosive to get through barrier

[Anife]

Yea, last one is on second floor of building, which I'm not sure is reachable without last upgrade (grappling axe)
https://steamcommunity.com/sharedfiles/filedetails/?id=2411672973