This is how my tiny bullpup looks like, more or less. The only changes I'm making to it is the air reservoir. As this small volume gives a very low shot count:The air reservoir that is used in the picture is a co2 hose from rap4, as it is made for co2 I wouldn't fill it above 850 PSI. This gives it a very low shot count. You might ask why bother with the very low shot fill? My answer is that this airgun has the best of both worlds. What I mean by that is on one side, it doesn't take much pumps to get to 850 PSI with a stirrup pump compared to the regular 1377 that takes 10 pumps to get to full power and then you only get one shot. On the other side most PCP airguns need +100 pumps to get to max pressure. Plus i have the option of using a hpa tank to charge it up as shown below.The hpa tank has an ASA with two 1/8 NPT holes on it. one end has a check valve the other has an elbow and female QDC. The check valve acts as a bleed valve allowing you to remove the tank.There is a barrel shroud on mine that I made from an old flash light. I've dressed parts of it in 4D carbon fiber vinyl. The breech has a dovetail to picatinny rail extension on the front and a dovetail to picatinny rail on the back. the extension was used because the red dot isn't practical so far back. Rear rail is there so that my eye is inline with the red dot. On top of the picatinny rails are rubber grips normally used on AR15 style rifles, i used these for comfort.The trigger extension is very simple. It's a bar of aluminium that has be cut/filed/sanded into a trigger:The trigger extension has a hole drilled through it that is slightly larger than the OD of the threads of the screw. There is a smaller hole in the actual trigger, the screw is taped into it, allowing the trigger extension to pivot. The black piece of metal stops the trigger extension from moving up. There is a piece of spring steel that stops the trigger extension from moving side to side. Parts of the trigger frame and trigger extension has been filed out to allow the trigger extension to slide parallel to the trigger.
Looks interesting...but, I don't see where you pinned the valve. Joe