In regards to the above post - I do not believe the breech plug is tack welded; what you're seeing is how the tang is attached. I owned about six of these throughout the years, the first one was purchased from EMF back about 1970 or so. It cost 20.00 and that included shipping. Even back then that was not a lot of money. All of the ones that I owned had that welded feature. Since they did not come proofed I did my own test using Dixie's suggested method, which really isn't a proof. In later years, for the last couple, I used the same proofing but I had access through work to a welding shop where they magnafluxed (SP?) them after I set them off. All had soft frizzens which I hardened with kasenit. Some had weak springs. I found a work-around for that by making a CVA mainspring for a percussion rifle fit with a little cobbling. The prices that they bring at on-line auctions are really high; far higher than their quality merits in my opinion. People pay what they choose, I guess. They are great fun, however.