Barbwire is not as easy to find. But taking a bat, making a crown of construction nails and tying it together with a lot of glue tape (otherwise, ahem, the nails will make the bat shatter) - the classic way is always the best.
You can also bite off nails’ heads with metal scissors, and use a good enough pipe, and make a very basic and close-range firearm. But that takes some experience and awareness of the dangers (like killing yourself occasionally when the thing blows up).
Slam some nails into it, and barbwire.
Barbwire is not as easy to find. But taking a bat, making a crown of construction nails and tying it together with a lot of glue tape (otherwise, ahem, the nails will make the bat shatter) - the classic way is always the best.
You can also bite off nails’ heads with metal scissors, and use a good enough pipe, and make a very basic and close-range firearm. But that takes some experience and awareness of the dangers (like killing yourself occasionally when the thing blows up).