Note: this may be a new version of the bolt than the one that was originally on your marker. It requires a plastic insert that you may not have.
Link to the correct Rear Bolt Plug Insert
See below for a list of markers this rear bolt will work on.
Rear Bolt - New Style on the Tippmann Model 98 DiagramRear Bolt - New Style on the Tippmann 98 Custom Pro Diagram
Rear Bolt - New Style on the Tippmann 98 Custom Platinum Series Ultra Basic - Non ACT Diagram
Rear Bolt on the Tippmann Cronus Diagram (1 of 2)
Rear Bolt - New Style on the Tippmann Triumph eXT Diagram
Rear Bolt - New Style on the Tippmann Triumph XL Diagram
Rear Bolt - New Style on the Tippmann Triumph XT Diagram
Rear Bolt - New Style on the Tippmann 98 Custom Diagram - Push Sear Style - Non ACT 2006-08-06