They send a screw with each barrel. Good thing too. The gorilla that installed my forend-screw on my 10 gauge is the same one that worked on Tim's BC. I munged that one up pretty bad trying to get it removed. Good thing I had a screwdriver that fit nice and tight.
Anyways, I have some extra laying around now from accessory barrels. I'll probably have more by the end of the year...
Nixter