The GG&G Under Forearm Integrated Rail for AR-15 heatshield handguards is an inexpensive solution for shooters who want to mount a vertical foregrip, bipod or other accessory at the 6 o'clock position without having to buy a guad rail or other handguard. The low profile design easily installs with handtools. Madefrom 6061-T6 solid billet aluminum and Type III hard-coat anodized matte black. Length of 4.625" and weight of 1.6oz. Made in the USA.