These barrel covers have a 6" opening.  This allows them to work with Flatline barrels, Apex tips, larger barrel shrouds, and rocket launchers (Havoc and similar).

This XL barrel cover designed with heavy duty CORDURA® fabric and reinforced elastic cord for safety when not in action. Elastic cord has a built in locking mechanism that will adjust to most paintball marker configurations on the market. Just because you have to be safe, doesn’t mean you can’t have a cool design!