The Fortis CamberAR15 Rail System featuring the new Camber Lock mounting system is the next evolution of the extremely popular handguards. Built for the end user that requires an even more rock solid platform. The Camber Lock is one of the industries' most solid mounting systems available. The stainless steel barrel nut & locking camber nuts are purpose built for rigidity & weight savings. Installation only requires a high quality castle nut wrench (not included) and with an included T30 Torx L-Key, you'll lock the rail down in a matter of minute. This rail system is very easy to install and more importantly, remove to service your weapon. MLOK slots in the usual 3, 6 & 9 O'clock positions with additional MLOK slots at the 1:30, 4:30, 7:30 & 10:30 positions for all your light & switch needs.