Easy FPS Editor lets you set up to 8 weapon types. You can do so in "Weapons Settings" option in "Objects Settings" menu.
By default there are no weapons. All you have to do to add it is rename one of them:
Each weapon is tied to a slot in player inventory banded to keys 1 to 8. To delete a weapon just click the button under the list. All properties are self explaining but there is a list with explanation at the bottom of this page.
Here you can set weapon position and scale:
Import sprites:
And import sounds:
Historically engine was made to work at 1280 by 720 resolution. So weapon position is bind to these sizes. Thus to center a weapon horizontally you'll need to set position to (640 - half width of the sprite).
It is strongly recommended to store resources separated from the project folder as they will be copied to appropriate folder and renamed as needed.
Weapon settings:
Max ammo - max ammo player can hold for this weapon.
Mag ammo - number of ammo in a magazine. Set to 0 to disable reloading.