I just bought a new Hk MR 556 Upper with the Fixed front sight and Rear drum dioapler sights on it. Will my Aimpoint Comp M4s co-witness with these Hk Iron sights? My Aimpoint has the Standard one knob mount on it,the one that clicks when it is locked down. I Like the Hk Irons and hopefully I will not have to buy a set of different Irons so I can use my Aimpoint. Please advise. Thanks:wink: