The construction of the new Mass Driver round prototype started from the internal core, which would require them to create a miniature and rapid acceleration stabilized version of the Portal Generator, modified for the chaotic energy field that would destabilize the energy beings.
The first part was easy. They had a lot of experience making things fit inside the Mass Driver rounds that would function correctly when the rounds were fired. The problem was getting the miniaturized version of the Portal Generator to work at all. It had been designed to a very specific standard, and the physics of it did not lend itself well to miniaturization.
The energy needed a certain amount of control to stabilize the frequencies, which was impossible with the size of the emitter they needed to use, while the shell of the round would initially block the projection of the energy.