I agree with NightJay, But I have to say that if you want to add a HuntinRifle to ammobox, you need to add the magazines too, for example:
this addWeaponCargo ["HuntingRifle" , 1]
this addMagazineCargo ["HuntingRiflemag" , 5]
If you add only the HuntingRifle and don't add the magazines to ammobox, it will appear, but without magazine
Cheers,
Aldo15