Breech loading bolt.
Single spring actuated ball valve.
Pistol grip with two stage trigger with removable safety.
Fully functioning adjustable rear sight.
360 fps muzzle velocity with a 68 cal paintball.
It's not intended to be used in matches but it was great fun to build, and pretty nice to shoot!
(also it says on the pictures "05/10/2006" it wasn't actually taken then, my camera c**cked up the previous day and so reset it's date.)