With the introduction of the ISSF 2013 Rules comes the need for a long safety line that passes through the barrel of all air rifles and pistols during competition. This 1m long plastic wire will easily pass through the full length of your barrel declaring it safe to all when not in use. It will also not harm your barrel or affect accuracy. Failure to use one of these in an ISSF competition will first result in a warning and later in disqualification if no action is taken.
ISSF Rule 188.8.131.52 - "To demonstrate that air rifles and air pistols are unloaded, the safety flag must be long enough to extend through the full length of the barrel".