What do you guys think of a push button valve? And using a cap gun as the hammer?

Link me to a good hammer valve idea or diagram so I can wrap my head around it?

Hello everyone I was doing some research and I want to make a semi automatic airsoft gun. And I was thinking of making a hammer valve possibly now is this the right way to go? Or would a qev be better? But the thing about a qev is I can't quite rap my head around the idea or it or how to effectively...

Hello everyone I am working on a new semi automatic airsoft gun. For my barrel I am using 6mm hard brake line and I want to have a magazine for this but how can I make it so the bb doesn't role around or out of the barrel? Please help and please give me some ideas for a magazine thanks in advance!