Despite being a gun store, there are no guns or ammo to be found. According to the owner, Hank, there were too many robbers to fend off during the outbreak, when total chaos and anarchy plagued the city.
The name "United Arms" may be a reference to an Allied poster used during World War II — it featured four Allied "United" Arms destroying the Nazi Swastika.
Zombies do not spawn in here, but they do enter if a horde attack is going on.
In the blue box in the store's sign, under "Guns, Ammo, Accessories," it says, "We Also Buy," meaning that the store also purchases used guns from customers.