I walked into a gun store this morning and there was a discount table-o-crap at the front of the store. I gave it a quick once over, as is tradition, and found a twist lock barrel for $1! It looks to be in really good shape, only two minor scratches. The bore has lines in it. I tried to take a picture, but its not amazing. It could possibly be rifling, but it does not rotate like on an actual rifle. What did I buy?