Here is a true stock class cocker pump.
made with a couple phantom parts..
phantom 10 rd stock class feed
phantom pump handle
I had to grind/sand/polish the hump off that is located in the middle of the barrel. The stock threaded hole on the phantom pump handle is the same as a pump arm and was located exactly in the correct position.
Pumps beautifully. very very smooth and stable. no slop/play between the pump handle and barrel.
Just need to tune her.