they are purchased and some of them are blank firing grenades, some are smoke grenades. however they are considered pyrotechnics and are not allowed on most fields i know of here in Canada.
his videos are shot in the U.K and Scotland.
i dont even think you would be able to import these here
"You know what the chain of command is? It's the chain I go get and beat you with 'til ya understand who's in ruttin' command here."