Single shot won't empty the entire air tank with 1 shot will it?

Is there any huge downside to 1 shot only? I don't 1 shot, what are the benefits of semi auto?

Also for a reload system, would drilling a small hole out of the joining end of the barrel just big enough for a BB with a sliding cover to seal it and using a magnet underneath to hold it in place work?

Hi all, I am trying to replicate one of wyz2285's earlier designs seen in this video [youtube]https://youtu.be/pyG6SUS6ggE[/youtube] I have drawn a quick sketch of how I think it goes together but was wondering if somebody could take a look at it to see if its right and if it will work. http://imgur...

FPS of rifle? Looks amazing!