Shop › FORTIS NIGHT RAIL 556 12" MLOK BLK FORTIS NIGHT RAIL 556 12" MLOK BLK $230.80 Fortis Manufacturing, Inc. Night Rail, Free Float Rail System, Handguard, 12", M-LOK, Fits AR15, Black NTR-12-MLOK Add To Cart Added! Fortis Manufacturing, Inc. Night Rail, Free Float Rail System, Handguard, 12", M-LOK, Fits AR15, Black NTR-12-MLOK