I planned to have a large air resevoir tank made of PVC and endcaps, then attach it to the firing tank. You could have a semi-auto if you attached a barrel system straight to the firing tank, but ideally the valve I'm looking for would release the air when a certain pressure is reached behind it. This way, when the trigger is held down the air won't just blow through, it actually gives it a chance to pressurize. If you wanted both, you could set up some ball valve system.
I had this problem too. I used hot glue to secure my catch spring(s) to the catch piece. The glue created a kind of spacer underneath the springs, so the spring gets compressed more.
I know the standard size that is used for AR-15 springs is 4 3/4'', and the AR-15 spring and the [k26] aren't that different.
PM me if you get it working, I'm curious as to how this turns out.
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