Arisaka Defense Low Profile Rail, Fits Picatinny M-LOK, 3 Slot, Anodized Finish, Black LPR-M-3 The Arisaka Low Profile Picatinny Rail is a 5 or 3 slot Picatinny rail for M-Lok handguard systems. It offers a reduced height to pull any Picatinny accessories closer to the handguard. The 5 slot model connects with three 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.