Basically it has a reverse-spring powered pump attached directly to the tank so it compresses the spring, pushing air out the other end using the plunger, pushing the sealed (o-ring or some similar method) PVC down holding the copper breech cover, covering the breech.
Now that was quite a wasteful design as it used air I was supposed to have to shoot the dart out. Now it's just a breech design which uses a spring to open automatically once the trigger resets, then you close it with your first stroke on the pump or cocking mechanism. This would then stay closed while you pump more if needed, the only thing that will open it now is if you pull the catch mechanism for it. I'm going to rig it up to open that catch after the trigger comes back to the armed position.
The breech would look something like this:
Here's my tank designs:
Credit for the basic tank design would go to NerfCrazy: Homemade 2k Tank.
What do you all think? I can't wait to get parts for this... I'll make the tank first then see what I can do after that.
I'm thinking of an awesome trigger design but I'll have to draw it later.
Edited by 2iko, 08 August 2009 - 08:27 PM.