When I was building it I didn't know how well it would fire.
It has only one glitch:
the amo sometimes gets jamed and to fix the jam, you have to put your finger over the barel and blow to release them.
note: it won't fire with the barel plugged.
Step 1: Part One: the Barrel, Amo Chamber, and Amo
you'll need 25-26 of the amo(see the yellow box below).
Step 2: Part 2: the Loading Cap...
Just look at the pic below to build it and attatch it.
Step 3: Part 3: the "G" Clamp and How to Attatch It
Step 4: Part 4: the Safty Plug
Step 5: How to Load It
4 other pics are for a closer look.