GG&G's ETI UFIR Under Foregrip Rail for AR-15/M16 Rifle Handguards is extremely unique because it can be installed into the vent holes of the lower handguard without removing it from the weapon. In addition" no backing bushing" nut-serts or miscellaneous fasteners of any kind are required. The unique integral camming attachment system allows the rail to be easily installed and removed with a flat tip screwdriver without any alteration to the handguard. The ETI UFIR at just over 5 inches long is manufactured from 6061-T6 aluminum alloy and is Type III hard-coat anodized matte black to mil-spec. All steel components are manganese phosphated black. Lightweight at only 1.9oz" the GG&G ETI UFIR provides the end user with a MIL-STD-1913 dovetail on the lower handguard to mount a flashlight" bipod or other ancillary equipment.