Allow only one instance of prefab in scene

i have hotline miami like shooter and there are randomly spawns different weapon prefabs but i want spawn several weapon only one time, how to do that?

(for example ak-47 can be spawned 294921 times but i do not want that) (all weapon prefabs has same script) ,I have a hotline miami like shooter and there are randomly spawns different weapons, but i need only one instance of several weapon prefab but one gun can be spawned infinetly. (weapons are prefabs inherits one script) (for example ak-47 can be spawned 183940 times)