The wraith handguard was designed and built to fit most mil-spec ar15/m4 upper receivers.Boasting one of the easiest mounting systems to install in the industry, these m-lok slim-line handguards provide superior fit, finish and performance.-works with low-profile gas blocks-seven rows of mounting surface-streamlined 1913 picatinny top rail-type iii hard coat anodized.Rails: M-LOKFirearm Type: AR15/M4Finish: Black AnodizedPositions: 7