I came across this little stock and lock a while ago, and quickly gave it to a friend for parts. Today he gave it back to me when I mentioned I wanted to build a squirrel gun. It needs a barrel - so before I waste endless hours online, I thought the great minds here could help me Identify it. The barrel channel measures 29/32", which is just over 7/8", definitely too small for a 15/16" barrel. It uses a hooked breech. I'd like to find a small caliber barrel for it. Any help is appreciated.