Military Type III anodized 6061 T6 aluminum 6-sided fifteen inch free-float forend. Insert rails at 45 degree angles around the circumference of the forend for maximum versatility. Slide rails into any position on the forend for customization. Added heat vents on sides of forend to help dissipate heat. Includes aluminum picatinny rails: 15 inch low profile, four inch and two inch. Slotted barrel nut constructed of 6061 T6 aluminum with Type III anodized finish; eliminates need for jam nut and allows forend to be installed flush to receiver. Manufactured in USA. Fits most AR-15 variants.