i have tried to implement your solution, however it is not working.
In the events sheet, i have the below set up ;
Event 1 = Monster Health < or = 0 / Destroy
Set PistolSpawn to Random(2,3)
Event 2 =(condition 1)Monster on destroyed / Spawn Pistol on layer 0
(condition 2)Pistolspawn = 3
The instance variable is setup as a PistolSpawn, value starts at 0.
Thank you for the help guys