The Vanguard AR handguard by FAB Defense, featuring the M-LOK rail system, is a slim design that incorporates an innovative heat shield for optimal performance. FeaturesM-LOK compatible handguard accepts direct attachment M-LOK accessories or M-LOK 1913 Picatinny rail sectionsEasy installation, no Gunsmith requiredM-LOK Slots at the 6 position for mounting forward gripsM-LOK Side Slots at 2, 3, 9 & 10 positions for mounting additional accessoriesInnovative additional heatshield for proper thermal insulationTwo integrated QD sling swivel socketsExtremely durable polymer constructionCompatibility: Carbine length AR15/M4 models and variants without a gas block