I've bin farming old slappy for a very long time. I've killed him more than doc mercy and still no legendary. I am op8. How can I improve my chances at getting his drops?
I assume you want striker, since you mentioned you are farming old slappy. In that case the answer @skovacs1 linked won't help you. You can't really improve your success rate, the only thing you can improve is the execution speed. Get the best weapon you have and kill him as fast as you can, without taking the risk of dying (which increases kill time significantly). Also try to repeat the exact same routine all the time, because then you get better at executing it fast.