Bought two of these by mistake; threw away receipt and box so it is considered "used" since it has been sitting in a trunk with other stuff for a li while.
"Millett's M4 riser allows the mounting of scopes and other optics on flat top AR, M4 and other rifles using normal height scope rings. Solid and secure, the M4 riser allows proper cheek position for these style firearms. Riser clamps onto any Picatinny/Weaver-type base."
paid over $44.99 not including shipping, will sell for $35 TYD
This will fit AR, M4, or pretty much any rifle with compatable base to mount on. Here is a pic of my Mini with one one it-