The Arken Optics Rigid Precision cantilever style mount (20 MOA or 0 MOA) provides near 2.5 Inches of forward extension for better eye relief typically desired for use on AR style platforms. The Rigid Precision mounts are fully CNC machined from aircraft grade Aluminum resulting in the highest precision and tolerances possible. Note: Arken Optics recommends max torque settings no greater than 18in/lb for ring screws and 30in/lbs for base screws. The optic manufacturer's specification shall always supersede Arken's Halo Rings specification, unless higher.