Posted 30 July 2013 - 11:54 PM

First off, an overview of what the blaster looks like.This design is similar to most homemade airguns, and as such, the firing mech can be replaced with whichever sort of release mechanism desired, PVAT, Ball valve, WNTS, etc. Anything that isn't backpressure.It works much like Kane's 7-11, compressing air "in the pump", and does not have a secondary tank that stores pressure.The front nodule is the trigger, and is connected to the backwards check valve in the pump via steel rod. Depressing the front button is how you fire the blaster.A visualization of how the blaster works. "Snapshot" taken at moment of firing, red is pressurized.Materials2" PVCCaulk gun [large]2" piston cup 9411K14 [Can be substituted with anything that has a 100% seal]Firing mech of some kind [I used a check valve system]2" to 3/4" PVC reducer bushing3/4" PVCWashers, nuts, and bolts.Pic of the piston cupThe main body is just a piece of 2" pvc and the bushing couplered together.If you havent noticed yet, I forgot to take pictures during assembly, but the whole thing is pretty simple.Questions/Comments/Flames appreciated.