all i want to know is how to shoot a projectile form some kind of gun, not a laser but something like a bullet(and yes i have seen socials fps template, but i need to see some specifics on making a gun shoot in blender, at least in how to set it up)
Parent an empty to the gun and place it at the end of the barrel with add object actuator linked to keyboard sensor. Put the bullet in inactive layer. If you want ballistics make the bullet dynamic. Use collision sensor and end object actuator in the bullet to destroy it after it hits. Small and fast objects may go trough other objects without triggering collision because the physics engine can’t track them fast enough.