The IMI Defense Carbine Drop In Quadrail is machined out of an aircraft grade aluminium, these light weight Battle handguard  2 piece quadrails 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.