Shop › MAGPUL M-LOK POLY RAIL SECT 3 SLOTS MAGPUL M-LOK POLY RAIL SECT 3 SLOTS $10.40 Magpul Industries M-LOK Rail Section, Fits M-LOK Hand Guard, 3 Slots, Black MAG589-BLK Quantity: Add To Cart Added! Magpul Industries M-LOK Rail Section, Fits M-LOK Hand Guard, 3 Slots, Black MAG589-BLK