Yankee Hill Machine Co, Carbine Handguard, 2 Piece, Fits AR-15's with Carbine Length Gas Systems and Fixed Front Sight Gas Block, Will Not Fit Colt AR15, Anodized Finish, BlackThese handguards are designed to replace your standard plastic handguards with their 4 rail picatinny design. Simply remove your existing handguard panels and insert these in their place. Features : Lightweight aircraft grade aluminum ,Total Length: 6. 625" (inches), Total Weight: 10. 464 Oz Hardcoat Anodized matte black to Military Specifications or better The bottom rail removes easily to accommodate accessories such as grenade launchers, flare