👉 A basis weapon, also known as a primary weapon or default weapon in firearms, is the standard firearm that a shooter is legally permitted to carry and use in most jurisdictions. It is typically the weapon with the highest capacity and reliability, often a semi-automatic pistol or rifle, which is designed to be easily accessible and effective in various combat or self-defense scenarios. The basis weapon is usually the first choice for law enforcement officers and military personnel, and its selection is often standardized to ensure consistency and ease of training.