Thanks Bill, I was looking through Ruth's book but wasn't aware the U.S. had never adopted the BFA. That makes sense though because I`ve never seen them in use in photos. The further script indicates other countries use of them. The diagrams show several examples of brass blank. I know the power of grenade launching cartridges because I personally blew up an F.N. in 1974 with a C33 launching cartrige and BFA. Quite by accident and ignorance I assure you.