For sale is an Accucam Quick-Detach Standard Base by GG&G (Quick Detach (QD) Scope Ring Mount - Standard Base for AR-15 and M-16 Rifles). It is a 1913 rail interface which raises the height of the mounting platform by 1/2". It's in perfect condition and has never been mounted on a rifle which has been fired. I had intended to mount a hunting scope on this and use it on my AR15, but never got around to it, and have since decided to go in another direction with my rifle/optic setup. This would be great for someone who wishes to place a riser under a red dot (for co-witness purposes), or who wishes to add QD capability to their optic. Would like $135 shipped or face-to-face.