You can get a gun in ROB RUN by finding weapons as city loot or buying them on the Black Market through Lenny or the laptop at your base. If you choose to buy, distinguish unlocking a weapon from purchasing it, since gameplay recordings show these as separate steps. Check your ammunition too: owning a gun does not necessarily mean it has ammo ready to fire.
Find a gun while searching the city
The official help center confirms that weapons appear as city loot, making exploration an alternative to a Black Market purchase. Peanut's gameplay includes a specific example: a player discovers a gun on a table to the right in a back room. Look around interior spaces as you search, but treat that discovery as an example rather than a guaranteed spawn at that table or in every back room.
Buy through Lenny or the base laptop
Choose either Lenny or the laptop at your base to reach Black Market weapon purchases. In Peanut's gameplay, an apparently free gun option turns out to unlock the gun, so selecting an unlock should not be treated as receiving the gun itself. Read the transaction label before selecting that option, especially if you are relying on it to supply the weapon for your next trip into the city.
The distinction also matters when you work out whether you can afford a gun. Peanut later compares the two costs and finds buying cheaper than unlocking in that session, while Zombo Land's first-pistol sequence describes unlocking the pistol before buying it. Check the current unlock and purchase options together before spending your money, because the price of one transaction does not tell you the cost of the other.
Raise money for your first pistol
If you are starting without a gun and want to work toward a purchase, Zombo Land's gameplay demonstrates searching dumpsters for money and items. In that recording, holding E searches the container, and the finds include cash as well as items such as laptops and toasters. These are examples from that session, so use the search as a way to gather what is available rather than expecting a particular item or payout.
The selling step in that route requires a change of role: Zombo Land explains that you must become a criminal to sell to the fence. The recording demonstrates holding F to make that change before selling, rather than showing the entire gathering-and-selling process in civilian mode. Criminal mode also brings police pursuit, so the decision to sell belongs alongside the risks of becoming a criminal.
After selling, the same gameplay sequence describes taking a road exit back to the hotel or base and then buying a first pistol. That gives you a practical sequence to follow: search containers, sell suitable finds in criminal mode, and return to pursue the purchase. Your own haul still determines what you can afford; the recorded example is not a promise that a single collecting trip will cover a pistol.
Prepare ammunition and supporting equipment
Make ammunition part of your purchase planning instead of stopping as soon as you have a weapon. Peanut's gameplay includes a player holding a gun with no ammo in it, showing why possession alone does not guarantee that you can immediately shoot. The same recording separately shows purchases of SMG ammo and pistol ammo, so pay attention to which ammunition you are buying for the weapon you intend to use.
The Black Market also offers equipment beyond guns, with Zombo Land's recorded browsing showing ammunition, medicines, painkillers, an injector, smoke grenades, fragmentation grenades, and light ballistic protection. These give you other loadout options to consider alongside a weapon, rather than forming a required shopping list before you can obtain one. For your first gun purchase, keep the weapon and its ammunition in view before deciding which additional equipment you want to buy.
Understand the weapon you have found
Callmetrouble87's gameplay overview describes loot variants including shotguns with silencers and AKs with red-dot sights. Those examples establish that weapons with those features appeared in the version being shown, without establishing a player-controlled attachment system. Judge a found weapon by what it actually offers rather than assuming you can reproduce a recorded variant by installing the same accessories yourself. The same overview describes the game as mainly third-person, switching to first-person when you aim down the sights.
Use a gun during a robbery with care
In Callmetrouble87's robbery advice, holding employees at gunpoint helps stop them from calling the police. The advice also says you need to remind them that you are armed, so a single threat should not be treated as permanently preventing a call. This describes a use for the gun during a robbery, not a guarantee that carrying one makes the robbery succeed.
The same gameplay advice recommends entering from the back, disabling the alarm, and shooting out cameras as preparations. Those are separate considerations from keeping employees threatened, so obtaining a gun does not mean every source of an alert has been handled. Keep the distinction in mind when planning a robbery: dealing with a person and dealing with the shop's security are different parts of the recorded advice.
Consider keys, police progression, and loss risk
Keys can connect one robbery opportunity to another, with Callmetrouble87 giving the example of finding a gun-shop key and then visiting that shop. The example starts with an easier shop such as a gas station, but it does not make a gas station a guaranteed source of that key. Treat a gun-shop key as an opportunity if you find one, rather than assuming that repeatedly visiting a particular shop will produce it.
Police progression is another route to weapon access described in Callmetrouble87's gameplay overview. The sequence is to visit the police station, get a badge and car, and arrest criminals, with more arrests opening access to better guns and cars. That describes equipment access within the police route, rather than proving those guns become permanent private weapons.
For a criminal loadout, remember the role description read out in Peanut's recording: criminals lose their inventory items on death. Criminal mode allows crimes, brings police pursuit, and is disabled when you leave the city. Factor that loss risk into what you take with you, without assuming that arrest or other events necessarily follow the same equipment-loss rule as death.