2.4&1/2 ft. of pvc pipe
Step 2: Converting launch tube
first cut a hole in the launch tube for the breech.Then shave off some of the cardboard from the top so you still have to jam it into the pipe but it will not damage it.(about 1 1/2 in) (see picture) Then shave off some for the breech cover about 5 in. or more.
Step 3: Finishing
saw off the 1/2 ft. of the pvc pipe and use it as a breech cover leave the fuse out and light it.Then close the breech asap!!!! not a good idea to hold it! use as a cannon i am not responsable for u killing yourself!!! the end.