This mount was designed to set on the variety of 308 flat top receivers but it has proved to be versatile base for many different purposes.  This aluminum mount with full Picatinny rail will extend the mounting platform area to the front or rear.  This mount is constructed of T6 6061 hard coated black anodized aluminum. Raises the 1913 rail up .550 from the receiver. The overall length of the riser is 9". And weighs 5.44 ounces.  Rail has 20 minutes of angle machined into mount.