Thank you for the valuable information, but that was not exactly my question. Let me specify, because I've just found the entry "LNAM - NPC add ammo list" each weapon has, which might be part of the solution. So, the Combat Rifle has the following two entries in FO4edit (among many others): DNAM - Data // Ammo: Ammo45Caliber ".45 Round" [AMMO:0001F66A] LNAM - NPC add ammo list: LL_Ammo_CombatRifle [LVLI:000E0303] If I now changed the Combat Rifle to use "Ammo556 "5.56 Round" [AMMO:0001F278]", how should I change the "LNAM - NPC add ammo list" entry to ensure all enemies using the combat Rifle have the right ammo in their inventory (and can actually use the gun!)? Would changing it to "LL_Ammo_Assaultrifle [LVLI:0018ABDE]" work right? The expected behavior would be that each combat-rifle using NPC would spawn with a few rounds of 5,56 ammo and could use his gun. Then again, what's with those NPC'S/enemies that spawn with a combat rifle, but have the .308 conversion mod on their gun? EDIT: I found the .308 mod in the "object modification" main category. It seems to make changes both in the "Ammo" and the "NPCAmmoList" entries, so this should be a non-issue for the question above.