This model fits: AR15/M4 Carbine Length Gas Systems. This replaces standard Carbine and M4 Length handguards. This handguard extends past the Handguard cap and is designed to fit around the front sight post and bayonet lug. Solid fit, top PICATINNY rail is at receiver height and you have 7 angled rows of KeyMod slots Includes two Accessory KeyMod to PICATINNY Rail Sections. One Short (5 slot PICATINNY) and one Medium (11 slot PICATINNY) length rail sections. They can be placed in any of the 7 angled rows of KeyMod slots.