Oh man, connect sure does butcher screenshots with super low resolutions -- so it is kinda hard to read what you posted, but I think this is what you were trying to do: in WeaponPickup.cs: public class WeaponPickup : MonoBehaviour { public int ammoInThisContainer; <OTHER STUFF> void OnPicked(PlayerCharacterController byPlayer) { <OTHER STUFF> if ( ammoInThisContainer > 0 ) { Debug.Log("adding ammo to weapon for player " + ammoInThisContainer); weaponPrefab.UpdateTotalAmmo(ammoInThisContainer); } } and in WeaponController.cs: public class WeaponController : MonoBehaviour { <OTHER STUFF> public int totalAmmo = 0; <OTHER STUFF> public void UpdateTotalAmmo(int ammo) { totalAmmo += ammo; Debug.Log("Total Ammo now: " + totalAmmo); } } I've got some other changes in those two files, but you can see my completed files here: https://www.dropbox.com/s/uzxkdtjpc4s597n/WeaponController.cs?dl=0 https://www.dropbox.com/s/49umpcnnhzygf52/WeaponPickup.cs?dl=0 To use those, I added the weapon pickup (and pickup) script components to a sphere -- and then chose the weapon_shotgun and set the ammo to an amount > 0: https://www.dropbox.com/s/i5y6k5z0x3bi89d/adding_ammo.png?dl=0 Message me directly if you need more details.