If Daniel could build this in 40 hours, I want to see what he can come up with in a month's time!
"Fully semi-automatic, up to 14 shots. Capable of delivering over 18J kinetic energy, and speeds up to 110km/h! (42 gram projectiles). It’s a single stage gun, using a 8800uF(4×2200) capacitor bank with max 400v (704J). Max shot efficiency is 2.8% but reaches almost 4% at lower voltages.
Charge time for 300v (12J kinetic energy 396J capacitor bank) is 8 seconds for the mains connection, and when using the internal batteries about 90 seconds. It also has a Digital voltage display.
Coil overheat after 14 shots at 300v. Total weight: 5 kilogram. Total spend: ~~ 100 Euro. Construction time: ~~40 Hrs."
Check it out here.