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You can obtain the Railgun in both GTA 5 story mode as well as GTA Online.
GTA 5 How to get Railgun Online/Single
However, to get it in story mode, you must be a returning GTA player. A returning GTA player is someone who played the PS3 or Xbox 360 version of the game and moved their account to the PS4 or Xbox One.
But in GTA Online you can access the Railgun regardless of whether you are a returning player not. However, you can only access it in certain missions, since it is too powerful and would otherwise give you an unfair advantage over other players. In story mode you can use it whenever you want.
GTA Online
The easiest and the only way to get the Rail Gun in GTA Online is to find the Gun Van and purchase it (657.000$) from that vendor.
Traveling Gun Van can be tracked from this website The position of gun van is always updated.
Gun Van Current Position [gtaweb.eu]
The Rail Gun can also be used in a set number of Adversary Modes and Bunker Missions in GTA Online. Note that, in contrast to story mode, you can access the Railgun whether you are a returning player or not. In Adversary Modes, the railgun is part of different loadouts such as the Assault class setup in Beast vs. Slasher, Juggernaut’s class in Power Mad, etc.
You can find the GTA Online Gun Van in a different location each day, as this illicit weapon salesman is constantly on the move to avoid any unwelcome attention. It’s worth taking the time to track them down though, as they offer a selection of unregulated items that often includes weapons you can’t buy at Ammu-Nation or elsewhere. Because they’re not following the rules, any unlock requirements for their current stock is waived, which means you can pick up a Minigun right now that you’d normally need to be rank 120 to purchase. The amounts charged at the Gun Van do carry a premium, but with GTA Online new weapons and other handy items available it’s a small price to pay for using this service.
Finding this Vapid Speedo van is the best way to bulk out your arsenal in GTA Online, but that’s easier said than done as it moves location on a daily basis to avoid any undesirable heat from the authorities or other interested parties. With that in mind, here’s everything you need to know about where to find the Gun Van in GTA Online and what’s currently on offer from their inventory.
All possible places to find the traveling gun van:
Story mode
2 Methods available to get it in Story mode.
1. Minor Turbulence
In Story Mode, if you are a returning player, you can easily buy the Railgun through any Ammu-Nation after completing the main story mission ‘Minor Turbulence’. It will be available to purchase for $250,000.
Once you complete Minor Turbulence, head over to the crash site of the airplane from the mission at Alamo Sea. You will find a Railgun in the cockpit section of the wrecked plane. It is highly recommended that you first obtain a Scuba Diving Gear and then head over to the location, as the wreckage is deep underwater.
2. Shooting Range Method
If you haven’t completed the mission yet, and accordingly the gun is not available to buy at the Ammu-Nation, then you can head over to the shooting range and select the “Bonus” challenge. This will let you choose a challenge that utilizes the Railgun. Then simply at your feet and shoot to kill yourself, which will spawn you back into the open world with the Railgun.