Paintball gun barrel construction

Abstract

Gun barrel construction with bore surfaces defined by different curvature surfaces which, in conjunction with dynamic fluid pressure, serve to confine a spherical projectile against lateral displacement. Rotation is imparted to the projectile in a direction contra to projectile travel to enhance range of the projectile.

1 - A gun barrel receiving a spherical projectile including, 
 an arcuate surface.    surfaces of lesser curvature contiguous with the arcuate surface and along which a spherical projectile may travel, and    vent means effecting a pressure drop across a moving projectile biasing the projectile into rolling contact with said surfaces.    
   
   
       2 - A gun barrel for a spherical projectile and having a bore defined by 
 a primary surface formed on a radius,    secondary surfaces formed on radii greater than the radius of the primary surface and along which a spherical projectile travels, and    vent means for effecting a pressure drop across a moving projectile to bias the projectile into rolling contact with said secondary surfaces.    
   
   
       3 - A gun barrel for a ball shaped projectile and including 
 a primary arc having a first radius,    secondary arcs each formed on a radius greater than said first radius,    said primary arc defining along with a projectile a space for a fluid flow acting on a projectile and urging same into contact with the secondary arcs imparting counter rotation to the projectile, and    vents spaced in linear fashion along the barrel.    
   
   
       4 - A gun barrel through which a spherical bullet travels, said barrel having a bore defined by a primary wall formed on a radius and secondary walls each formed on a radius greater than that of the primary wall to provide tracks along the barrel on which the spherical bullet travels in a guided manner in the presence of fluid pressure acting on the bullet and urging the bullet into rolling contact with the secondary walls imparting rotation to the bullet counter to the direction of bullet travel, and 
 vent means in communication with the bore at a location intermediate said secondary walls.