The Daniel Defense Omega Rail is a premium upgrade to AR’s with plastic handguards and is now available with Picatinny, KeyMod or M-LOK attachment system. Its free-float design allows the individual operator to install it with the Allen wrench provided and requires ZERO modification to the weapon! Our 12 inch Keymod, free float, quad rail handguard installs on standard mid length AR-15 rifles and the universal Keymod rail platform accepts all standard Keymod accessories. The free float handguard attaches directly to the receiver, without touching the barrel or impacting barrel harmonics, thus allowing for more precise shooting.

Daniel Defense Free Float Rail Installation Guide

Weapon System: AR15/ M16
Manufacturer:Daniel Defense
Item Installed: Daniel Defense 7.0 Lite Rail
Purpose of Item: A free floating rail allows for multiple attachment points of equipment, to include optics, vertical foregrips, lights, lasers, and other items. A FF rail also allows for better accuracy by the barrel not being touched by the forearm. For many users, it is more a matter of a stable handguard/ rail that will not rattle or wiggle under hard use than it is absolute accuracy. There are several different styles of Free Float rails. This is a single piece rail as opposed to some which are two piece.
It may be of interest to the reader that Daniel Defense was awarded the SOCOM SOPMOD RIS II rail contract. This rail attaches in the same manner as the DD Lite series of rail, and was shown to be secure, and ran the trials without any incidents or problems. While there might be higher praise for a rail system, I certainly can’t think of it. The military version of this rail includes a detachable lower rail, and mounts for a M203 grenade launcher. Daniel Defense has these available for sale on the commercial market if this is something you find interesting.
Tools Needed:
Vise
Receiver blocks
Barrel wrench
Hammer
Punch
Loctite (new model lite rails come with loctite on the screws)
DD barrel nut wrench
Items Included:
Rail
Allen head cap screws with thread locker
Barrel nut
Barrel nut collar
Rail covers
The Daniel Defense Lite Rail (DD 7.0 Lite) is a Free Floating Rail designed to be installed and used on a standard AR15/ M4 carbine. This guide does not act as a substitute for real world knowledge, and is not designed to turn the reader into a professional “gun plumber”. However, it is my belief that the overall installation process is simple enough for anyone who is familiar with the AR15, and has a basic level of skill with simple hand tools. This is based on my own method of installation, and all liability is with the end user. If you stab yourself, shoot yourself, or find some other manner of getting yourself hurt, you are responsible for your own actions. If you have doubts, get help.
NOTE- The rail used in this installation has been previously installed, as well as used on a training weapon. While you may see scratches or a little wear, this was caused by me, and it isn't how the rail comes out of the box.

The SOCOM RIS II rail contract provided all current and upcoming weapon and accessory manufacturers with an opportunity to demonstrate outside the box development, and enter into trials for the (at that time) upcoming rail selection.
Instructions

ARMS, KAC, and DD all advanced past initial testing with high quality rail systems which humbled their competitors. Regardless of the outcome, all three had shown that they were solid performers. Of course in the end, the selection was narrowed to one, with Daniel Defense being awarded the contract and becoming the sole source supplier for SOCOM.
Daniel

Below reads the Daniel Defense description for the DD RIS II rail, but the end product isn't how it started out, nor it is likely to be the final product either.

The Daniel Defense RIS II allows the individual operator to free float the M203 grenade launcher without additional parts. As importantly, special tools are not required to mount the M203 grenade launcher. This was accomplished by integrating all of the needed parts to free float the M203 into the rail itself.
The Daniel Defense RIS II free-floating Picatinny rail systems are designed to allow individual operator to quickly, and without special tools, mount M203 Grenade Launcher and precisely mount SOPMOD accessories to host weapon without effecting point of impact.

The original DD RIS II extended past the standard FSB through the use of a cutout in the upper rail. It also used 2 machined screws to lock the lower portion in place. Once the screws were removed, the rail pulls down from the front, then out. In the below picture you can see the 203 mounts that swing down.

Daniel Defense Free Float Rail Installation Guide