Businesses involved in the manufacture, sale, or distribution of firearms, weapons, explosives, and related materials. This category includes guns, ammunition, weapon components, and accessories. Due to strict regulations, legal restrictions, and potential misuse, these products are considered high-risk. The category may also encompasses replicas, toys resembling modern firearms, and less-lethal self-defense items like pepper spray and stun guns. Mastercard unveiled a new MCC for guns and ammunition shops in July 2024 with category code 5723, so this category is somewhat deprecated. Firearms may also appear under MCC 5099, 'Durable Goods, Not Elsewhere Classified', which can be a category that acts as a hiding place for unlicensed firearm sales since it encompasses a wide range of products.

SafetyKit helps enforce complex regulations surrounding these products, including age verification, licensing requirements, and shipping restrictions that vary by jurisdiction.