Very lightweight, strong and matches magpul fde furniture - OpticsPlanet Exclusive Fortis Manufacturing F1 Optics Mount - Absolute Co-Witness

I mounted this on my AR with a Sig Romeo 5 optic. It has blocks for locking into the Aimpoint T1 style bases as well as M1913 rail slots where it attaches to the rail system. This results in minimizing any back and forth play of your optic. It also comes with a tube of blue loctite! I have not taken it to the range yet, but I have no doubt that it will hold a zero like a champ given the construction quality and dual screw rail mount system. It matches my Magpul FDE furniture very closely as well.