Help modeling a cocking handle

MAC11
Hello, i am trying to model a cocking handle for my MAC-11 model. What would be the best way to go about modelling the little bumps on the cocking handle?

Hi
Not sure if it is the best way, but one of them is to select every other face, Alt+E -> Extrude faces along normals

Thank you, looks good enough for me since im still a beginner at blender