Vortex cap BBMG
This type of BB machine gun has a unique mechanism of operation and is typically a cap in shape and is made out of strong materials such as PVC or metal. Their construction is similar to the vortex block, in which an air inlet and a hole for a barrel are drilled perpendicular to each other. The vortex cap was designed by Gatorlangman AKA DavidVaini and provides a small substitute to the standard vortex or inline vortex blocks.
Since the cap itself creates the vortex easy modifications can be done to make magazines. A screw on cap with a spring housed inside of a pipe can be snapped down into a vortex cap for an easy-to-use magazine loaded system. Some of the designs for magazines are shown in the image below:
