There are two steps to setup Hook of the Reaper. The first is to add your light gun(s) to Hook of the Reaper. After adding the light gun(s), then the light gun(s) need to be assigned. They will be assigned to a player number.

First Step: Add Light Gun(s) to Hook of the Reaper

Add Retro Shooter's RS3 Reaper
Add Retro Shooter's MX24
Add Gun4IR Light Gun
Add Fusion Light Gun
Add Blamcon Light Gun
Add OpenFire Light Gun
Add Alien Light Gun
Add XGunner Light Gun
Add Ultimarc AimTrak Light Gun
Add Sinden Light Gun
Add Unsupported Serial Port Light Gun

Second Step: Assign Light Guns in Player Assignment

Assign Light Gun to Players