My contract with Military Times prevents me from copying the information from one site to the other. Hit the link below for more information, pictures, and the writeup.

The Fortis Rail Attachment Point is a 6061 aluminum hard coat anodized, made in the USA, anti rotation sling mount. While that is a mouth full to say, in use, the Fortis RAP is an extremely small unit which takes up minimal space on your rail. These are selling for around $20, and my feeling is that they are well worth it. My personal preference is mounting it on the top rail in front of my optic, but you can attach yours however you enjoy slinging your weapon most.

http://militarytimes.com/blogs/gears...ent-point-rap/