I have a .12 gauge shotgun that I believe to be a 1900 single shot. It was in pieces in my dads gun cabinet and I wanted to get it fixed. The only problem is when I took it to the gunsmith he said he couldn't find any parts for it. The only thing it needs is a stock and stock bolt. It also needs, I think its called a locking bolt, and whatever holds the trigger guard to the locking bolt. The hammer cocks and holds if I push the trigger forward and hold the assembly in place. Any help would greatly be appreciated on how to fix or find parts. Thanks