This one-piece, detachable Proper Eye Position Ready (P.E.P.R.) Mount was designed specifically for mounting combat riflescopes atop M4 flattop receivers and AR-15 weapons. Provides 2" of forward scope positioning for long-eye-relief scopes. Constructed from durable aluminum. Ring bases are milled as a single unit. The Weaver-style mounts on top of the rings accommodate additional accessories. Ring height: 1" (measured from bottom of scope tube to top of base).
Sinclair, Issue:3B, Page:202