See also Brigador: apart from the various lasers, exotic ballistics, and nightmarish chemical weapons it includes, there’s also the prosaic “Mãe Dois.” The tech entry leaves no doubt about what it is:

My understanding is that this weapon not only predates the colonies, but space travel entirely. If that is the case then it’s a truly venerable design, and one I’m told will continue to serve for the foreseeable future.