I see no real issue in scaling up the tech in the repulse hand to be utilized in a form similar to a concussion rifle. However I would also think that it would be more of an area denial system rather than a targeted shot and thus suffer from a shorter range. Not just a one hit wonder. While the single hit would certainly have a chance of breaking bone, more likely you would end up with the broken skin, depending on level of armor you are facing.
In regards to armor, obviously it is going to be most effective against soft, unarmored targets. From there the armor would need to be bypassed in some form first.The way it seems to detail the hand is that it uses the repulsor fields to create instability in the target by creating a pressure wave. So let's say you are up against an opponent who is fully armored. Unless you were to hit the gaps of the armor at close range(maybe a couple or few meters at most given that this would be a hand mounted system), that the armor will absorb a good amount of the blast in the plates. So you'd likely cause serious bruising, possibly dislocation or small fractures on the armored sections. Unarmored section, or those protected simply by armorweave or a similar material would be more apt to see a broken bone that would render them unable to fight, or possibly cause more grievous harm. That is completely discounting the use of any personal shielding or Force Barrier/Bubble type of defense, both of which would likely lessen the effects of the weapon rather harshly.
Take my thoughts on the system as you will, this is just based on my understanding of the basic underlying principles.
