I used my Semi2K method with two 2K valves. The clip system is gravity-fed. It works like this. The clip is inserted on the top of the breech. A nail directly connected to the trigger sticks inside of the breech and has a slot to slide with the trigger. When the valve is open the pin can still come back about 1/4in. So after the pin is pulled, the clip advances halfway down the the next barrel. When the trigger is pulled forward into resting position the clip falls down the other half and the next barrel is ready. Here are two more pics.
This failed because we were out of high-temp hot glue so i used low-temp, which made everything kinda fall apart. Another reason this didn't work is because the trigger spring was powerful enough to pull the back valve open at low pressure but when put to high pressure it wasn't strong enough the pull the back valve open, and a spring that was any stronger would have been nearly impossible to pull. Wow i just realized that this was quite a messy job. Hopefully one of you can build off what i've done and make the first fully semi-auto 2K.
