The Daniel Defense 00510002 is an Omega Rail system designed with a free-floating structure. This provides the user the convenience of installing it using the supplied Allen Wrench. Notable features of this rail system include an integral QD sling swivel mount augmented with a rotation limiter, and a seamless upper rail platform.Constructed from aircraft grade aluminum, this rail system boasts of lightweight yet robust build. Adding an elegant touch is the black hardcoat anodized finish. This variant is made specifically to be compatible with AR15 rifles. The rail is 8.88\" in length.