In the first city available in the game - Ostradnoye, you can get two firearms for free. On this page of the ATOM RPG tutorial, you will learn what you need to do to get weapons, thanks to which you will be able to fight much faster right from the beginning of the game.
Old hunting rifle
The first thing you need to do is to talk to an old man. He will ask you to harvest and bring corn.
Maize is just behind his hut. Collect all the corn and return to the old man.
After talking to the old man, he will give you the rifle. Remember that you won't have ammunition for it.
Wooden Assault Rifle
Find an abandoned cabin on the right side of Ostradnoye.
Find the light switch. Notice the trap door on the floor.
Open the trap door and go down to the bunker beneath the cabin. You will find a few interesting items here.
This weapon is lying on one of the shelves. Remember, it doesn't have ammo.