This is one of the main features that really gives the sniper rifle its rifle appearance.  Instead of taking the long period of time to muzzle load a projectile, which is actually very dangerous when the chamber is charfed,  you simply insert the projectile and with a click click you're ready to go. This device took me several attempts to make and I'm not entirely sure how it all worked together.  All the pipe sizes that I used can't be modified because each fitting a pipe fits perfectly inside the next.  So a 1 1/4" barrel is what I have to deal with.  I typically shoot the little fruits that come off of a sycamore tree in the fall.  They work perfectly.  I am working on a design in which the barrel is stationary at all times and does not mobe.  I would aslo like to use a different barrel size.  As the device develops you can expect to see more info. on my products page.