The Arisaka Low Profile Picatinny Rail for M-Lok handguard systems features a reduced height to pull any picatinny accessories closer to the handguard. The 5 slot model connects with three of Magpul's M-Lok nuts which will spread the increased stress of large picatinny accessories like bipods or vertical grips over more M-Lok slots. The 3 slot version is useful when less rail space is required.NoteRequires a 1/8" Allen wrench for installation (not included).