The Vanguard AR is the new handguard by FAB Defense, featuring the M-LOK rail system, in a slim design that incorporates an innovative heat shield for optimal performance. Features: M-LOK compatible handguard accepts direct attachment M-LOK accessories or M-LOK 1913 Picatinny rail sections Easy installation, no Gunsmith required M-LOK Slots at the 6 position for mounting forward grips M-LOK Side Slots at 2, 3, 9 & 10 positions for mounting additional accessories Innovative additional heatshield for proper thermal insulation Two integrated QD sling swivel sockets Extremely durable polymer construction Compatibility: Carbine length AR15/M4 models and variants without a gas block