Aim Sports Wraith Handguard AR15/M4 Black Hardcoat Anodized 13.50" M-LOK 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. Firearm Type: AR15/M4 Finish: Black Hardcoat Anodized Positions: 7 Rails: M-LOK