the combustion chamber is wood, the cleanout cap is actually a little door, it swings on a hinge and uses a lock(i forget the name, it's the slidey kind), and a bent piece of metal to keep the door shut, the barrel is 1 inch sch 40 with about a million wraps of duct-tape to increase it to a threaded 2 inch(i think) to 4 inch adapter, then i hot glued that onto the front of the chamber, i went a little crazy with the hot glue, covered everything, oh well it could only help

sorry bout some of the pics being kinda blurry, i was cold, tired, hungry, and i had to pee
pics:
whole gun

top view

closer top view

side view

lock

back, door closed

back, door opened

left side/door hinge

hot glue

no damage pics 'till tomorrow (i hope)
edit: OOOOWWOWOOWOWOWOWWOW...there aren't any smilies for pain, i tried it a little while ago, tried static guard, that didn't work so i used hairspray, when i finally did fire, the back end wasn't sealed up enough and i burnt my finger, ow pain but it did leave a pretty cool scorch mark on the inside if the door

i need square o-rings :happy11: