The ball latch is a part of the Tippmann marker that prevents paintballs from rolling out of the barrel before being fired. If you are having an issue where balls are rolling out of your barrel when you aim the marker downward, it means that you need to replace your ball latch. Ball latches eventually wear down or break off and need to be replaced. <p> Tippmann Part Number FA-18 (also called TA45010 or 72211) <p> Compatible with the following markers: <br>PMI: PCS US5 <br>Tippmann: 68-Carbine, 98 Custom, 98 Custom ACT, 98 Custom Platinum Pro, 98 Custom Pro, A-5, Cronus, FT-12, Gryphon, Model 98, Pro-Am, Pro-Carbine, Pro-Lite, TPX Pistol, Triumph EXT/XL/XT, X-7, X-7 Phenom <br>US Army: Alpha Black Basic/Elite/E-Grip, Carver One, Carver One w/ E-Grip Project Salvo <p> This item includes a one year warranty against defect from Captain O-Ring LLC. "Captain O-Ring" is a registered trademark of Captain O-Ring LLC.