For use on all A.R.M.S.® #21™, #22™, and #35™ Ring saddles. Shown mounted on #22 Ring. This unique ring cap was designed to expand the standard use of a cap normally only holding a scope in position, to that of allowing modular enhancements on various conventional optics by simply removing the standard cap and installing the tactical cap using the same socket head screws. Use this replacement ring top to mount a Tactical Ring Rail or Tactical Ring Sight. Throw Lever ring base and screws are not included with #22TRC.