While looking for a sealed 20 round box of USGI grenade launching cartridges i found 2 of the boxes below for sale and purchased them. One box is still factory sealed and the other was scotch taped shut many years ago so i opened that one to examine one cartridge. I’ve been told “they are made in Belgium by FN, for use (and probably sale) with their ENERGA type rifle grenades. These were tested as T-42 and adopted as the M31 by the U.S. in the early 1950s, but as far as I know we used our own cartridges with them. There may have been a standard NATO agreement on this type cartridge by then, but I cannot swear to that. Chris Punnett’s superb book ‘.30-06’ does not mention these, and only notes that most of the FN crimped type blanks were believed to be ‘noise’ blanks, so I suspect this is a pretty rare box.”
I’d appreciate any additional information anyone can share with me on the origins of the box. I only need 1 box for my collection so if anyone has a sealed USGI 20 rd box, 9 round box. and/or a mini spam can of USGI Grenade Launching cartridges, we can likely arrange a trade.