Military Type III anodized, 6061 T6 aluminum 8-sided free float forend. Insert rails at 45 degree angles around the circumference of the forend for ultimate versatility. Slide rails into any position on the forend for customization. Slotted barrel nut constructed of anodized 6061 T6 aluminum included. Three set screws lock the forend into place on the slotted barrel nut. Provides secure fit that cannot rotate; eliminates need for jam nut. Rails sold separately. Manufactured in the USA. Fits most AR-15 variants. Note: Does not fit AR-10 or .308 variants.