Heck, I would be happy if I could get one of their flip-up front BUIS\gas blocks that gets installed with taper pins. I would love to make a SAM-R clone but I just can't get comfortable with front sights being held on with set screws. The only other one I'm aware of is the GG&G unit which would suit me just fine but I don't know if they even make it any more but if they do, they are just as hard (and damn near as expensive) to find as the KAC model.