Model : YHM-9670 Yankee Hill Machine Two Piece Drop-In Carbine Handguard
From YHM:
"These handguards are designed to replace your standard plastic handguards with our 4 rail picatinny design. Simply remove your existing handguard panels and insert these in their place. No gunsmithing required!
*Note: Colt carbines require a special model, YHM-9670-C, see options above.*
•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 launchers and shotguns."