Troy's Revolution Rail maintains all of the properties customers love about the Troy Alpha Rail, but is 6.4 oz of carbon fiber construction. This gives you an even lighter and stronger option. The Troy Revolution Rail attaches to any standard AR. Installation does require removal of the delta ring, A2 sight, and installing a low profile gas block. This forend comes with 3 picatinny rails which can be added for attaching accessories to your rifles. The optional rails sizes are two 3" and one 5". Made of light weight aircraft aluminum, they bolt on in any configuration with included screw's and allen wrench. This rail is ideal for lightening your rifle and still having the ability to attach flashlight, laser, grips, or any picatinny mountable accessory. Attachments can be made at 8 angles. The construction allows the rail to run cool, even after extended firing. Available in Black Carbon Fiber and Black Matte.