The barrel cap is an essential part of every paintball player's safety equipment. It is pulled over the barrel and secured to the marker with a tear-resistant elastic band. If a shot is accidentally fired, it is caught by the barrel sock. The 'the FREAK Head' barrel cap is made of durable plastic and can withstand a series of shots. A significant advantage of the barrel cap over the barrel plug is that most of the broken ball remains in the barrel cap.

The use of barrel caps or socks is mandatory on all playing fields worldwide.