Stefan lies above the shifting block, and when the grip is pulled back, it pushes the block upwards underneath the breech, allowing the stefan to enter the breech. Grip moves forward, closing the stefan into the now-sealed breech, block moves down to accept another stefan in the tube, pushed forward by the spring. For loading: Take the cap off the front of the tube, which is connected to the spring to load stefans in. Put spring back in, and secure cap.
![PAS tube magazine UntitledbreechtubePAS](https://2img.net/h/i603.photobucket.com/albums/tt111/SlayerofOnE/untitledbreechtubePAS.jpg)
![PAS tube magazine UntitledbreechtubePAS](https://2img.net/h/i603.photobucket.com/albums/tt111/SlayerofOnE/untitledbreechtubePAS.jpg)