Recently I have become interested in Paintball, and I was looking for a kick-a** sniper gun. As I searched, I found that paintball sniper guns were a nearly non-existent category. I finally found what I was looking for, the coolest marker I had seen. Then I saw the price.
500-700$ was not in my budget. That got me thinking...
...why not make my own? Searching spudfiles, I found that there were many like-minded people. However, most the guns I found fired in one burst. In most paintball fields they do not allow "shotgun" rounds or metal-piercing velocities. Darn. 
There were few semi/auto guns that were feasible, as clouds and vortexes are not very usable for paintballs. Then I found the Slider and the GB semi, both by Clide. I took design ideas from their diagrams: The Slider and The GB Semi. If you do not understand my diagram, see these forms! The Slider shot paintballs semi-auto at a high velocity, but the pilot air was wasted. The GB Semi was more efficient, with no waste, and shot golf balls semi/auto. By scaling the GB Semi down, I came up with these plans.
The only problems with this setup was that it was attached to a compressor, so was not portable. I found how to make my own CO2 meter here, which would save me about 75$ than buying one. Unless there is a dirt-cheap one on e-bay... The regulator would also control paintball velocity by changing the psi. I also fit in a shock pump, and the quick-disconnect could be used with a compressor or regulated CO2. Also, CO2 is generally not good for PVC, as the cold temperature makes it brittle, so I added a liquid-to-gas expansion chamber. This might be made with ABS or some temperature and pressure resistant pipe. Another difference is that none of these guns are capable of using a non-airtight hopper efficiently. I will try to change that.
I added a hop-up and muzzle break to add to the sniper look and increase range. The barrel can be exchanged for a rifled, non-hop up barrel, or a longer or shorter length.
And finally, I wanted this gun to have looks. I wanted it to look the part, kind of like the Antimaterial Cannon. I am thinking of heat-forming sheet pvc to form a casing for the gun! Is this possible? To top it all off, I will add a laser and scope.
I am unsure of how efficient this gun will be, and if I can pull this off without a lathe. If all goes well, I hope to enter it in some kind of competition, so I was kind of reluctant to release the plans. My gift.
Please critique!
