Course, if Grav Round/Tracer Missile was instant they would just move on to interrupting Full Auto/Unload.
Interrupting a single ability should not immediately shut down a class. However, that is what interrupting Grav Round/Tracer Missile does since so many of our abilities are tied to it.
Make GR/TM instant and reduce its damage and either 1: Up the damage of our other abilities to make up for it, or 2: Return the proc possibility of CoF/Barrage back to 3 seconds instead of 6.
this. this exactly