The IMI Defense Carbine Drop-In Quadrail is machined from hardened aircraft aluminum, these lightweight Battle handguard  2 piece quad rails is a perfectly tight fit, ultra-slim cross-section, 4 full T-marked 1913 Picatinny rails at 12, 3, 6 & 9 O’clock and 5 QD sling swivel ports for perfect mission adaptability  – this is the ultimate battle rifle rail system.