So I decided to look back at this and the common thing is that the knocker doesn't properly hit the valve release without the upward pressure. I lurked around and managed to find someone on the philippines airsoft get suggest putting a nut on the valve release like in the article below
http://www.filairsoft.com/forum/show...em-help-please!
Anyone have experience with sticking a nut on the valve releases (size and what not) before I head to a hardware store with a mag in hand?