Kosher all the way, especially if it comes from FAB Defense. Keep it Israeli-made through and through!
That said, you need to take a Tavor Operator course. You will find that the rifle is designed for a purpose and it does it well without vertical grips or $300 triggers. When I took the course, we had this former Army guy who used a Tavor with a vertical handle. He had trouble holding steady during rapid-fire exercises. Horizontal target transitions were terrible and he had trouble hitting steel at 100 yards. He barely passed the quals at the end of the course...