These unique forearms feature diamond shaped heat vents, an extended top rail for gap-free installation, ,T, marked rails to mark accessory locations, they accept their end caps, and utilize their anti-rotation screws for secure installation. The forearms and barrel nuts are made of 6061-T6 aluminum and hardcoated to military specifications. The jam nut and anti-rotation screws are steel and plated a matte black finish to match.Features :Black finish"7.3" Black Diamond carbine length forearm,Comes with all necessary parts for installationFits AR-15