A spare barrel cap for JTS Airguns is a small metal or plastic component that is used to cover the end of the airgun's barrel. It is specifically designed to fit JTS airguns and can be used as a replacement part if the original barrel cap becomes damaged or lost. The spare barrel cap is typically made of high-quality materials to ensure its durability and protection of the barrel's end. Without a properly functioning barrel cap, the barrel's end may become damaged or contaminated, leading to inaccurate shooting and potential safety hazards.