IMPORTANT: This is V's megablok stash room. (the guns are the same in every apartment but the layout is different)

  1. Malorian Arms 3516, Pick up from Grayson's body in the Chippin' in mission
  2. Overwatch, Gifted by Panam when you complete her questline
  3. The Mox, Found in Judy's apartment after completing her questline
  4. Crash, Gifted by River when you complete his questline
  5. La Chingona Dorada, left at Pepe's Bar after the Ofrenda IMPORTANT: SEND JACKIE TO MAMA AFTER KONPEKI PLAZA
  6. Skippy, Found with a body in heywood (quest on map) IMPORTANT: NEED TO FINISH QUESTLINE TO ACTUALLY PUT IN THE STASH. (if you give Skippy to Regina she'll give you him back after a few days)
  7. Archangel, gifted to V by Kerry during his questline
  8. Plan B, Found in the badlands on Dex's body.
  9. Seraph, Gifted By Padre after completing all of his gigs
  10. Headhunter, Need to buy from West wind apartments Melee Weapon Vendor In Pacifica
  11. Nehan, Picked up from Saburo's body during the Konpeki Plaza heist
  12. Blue fang, Need to buy from Jackson Plains Melee weapon Vendor (Auto works fast travel point)
  13. Byakko, Gifted to V by Wakako after completing all of her gigs
  14. Errata, Found in one of the furnaces duuring the Disasterpiece quest
  15. Satori, Picked up from the Saburo's AV during the Konpeki Plaza heist
  16. Jinchu-maru, Picked up from Oda's body during the play it safe mission
  17. Butcher's Cleaver left behind by Placide when you meet him for the first time
  18. Ying-Long Needs to be crafted, recipe found at a Organized Crime Activity (OCA) in Wellsprings
  19. Lexington X-MOD2, Obtained by wining Wilson's shooting competition (I'm pretty sure that you can't win unless you shoot the same targets a few times)
  20. Moron Labe, Needs to be crafted, recipe found at OCA in West wind estate
  21. Sasquatch's Hammer, Obtained by beating Sasquatch in the Grand Imperial Mall
  22. Psalm 11:6, Needs to be crafted, recipe found at OCA in Northside
  23. Buzzsaw Needs to be crafted, recipe found at OCA in Northside (different OCA but still northside)
  24. Breakthrough, Needs to be crafted, recipe found at OCA in Rancho coronado
  25. Sovereign Needs to be crafted, recipe found at OCA in Japantown
  26. Bloody Maria, Gifted To V by El Capitan for completing all of his Gigs
  27. Headsman, Needs to be crafted, recipe found at OCA in North Oak
  28. Dying Night, Pick up from Wilson (Quest is called "The Gun")
  29. Comrade's Hammer, Needs to be crafted, recipe found at OCA in Arroyo

30. The spot for this gun only appears after you finish the main story, in order to get this weapon you need to loot Adam Smasher's body and then head to his room on the Ebunike ship. That's where you can find the crafting recipe for "Ba Xing Chong"

Another Important thing. some of the weapons (not all) can be bought from the merchant at the Dog town market but there are 2 things that you need to keep in mind:
1. They are ultra expensive
2. The merchant will only sell weapons that you could get but for some reason you didn't. For example if in a mission I get to choose between a gun or some money and I choose the second option then the Black Marketeer won't sell me that gun, because my choices didn't lead me into a situation that allowed me to get this weapon. (I really hope that this is understandable)