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Only one tier is necessary. Grenades are usually tier 3 so I can see 4 being appropriate, but tier isn't a sliding scale of 0-4, it should specify only its highest tier.
As with the ammo section and the replaceable parts/components as well. the former two i will be adding back today because i did genuinely forget about those but the latter is redundant as I'm not making any replaceable parts/components.
*Update* The tier has been fixed to its maximum tier as the weapons base tier, Ammo types added bellow from the template, and mechanisms re-added.