Replacement ball latch for the Tippmann Model 98, 98 Custom, Custom Pro, Pro-Lite, A-5, Pro-Carbine, BT-4 Combat, BT-4 Slice, BT-4 Combat ERC and BT Omega markers. What is a "Ball Detent"? It only allows one paintball to load into the gun breach at a time. It prevents double feeding and paintballs rolling down the barrel. Very Important! Every paintball marker has some type of "ball detent" in it.