The Arisaka Side Scout Mount (SSM) replaces the stock Picatinny rail adapter with a low-profile mount for M-Lok handguards, and tucks the light underneath either side of your ATPIAL laser/illuminator, ATPIAL-C, AN/PEQ15, or LA-5/PEQ. It's designed to be used with Surefire Scout Lights, the Arisaka 300 and 600 Series, and Streamlight Protac Rail Mount Lights. NoteCompatible with the Surefire M300A, M300B, M300C, M300V, M312, M322, M312V, M313V, M322V, M600B, M600C, M600P, M600U, M600V, M600DF, M612, M622, M603V, M612V, M622V, Streamlight Protac Rail Mount 1, 2 and HL-X, and Arisaka 300 and 600 Series.Requires a 1/8" Allen wrench and IP20/T20 Torx driver for installation (not included). A T9 Torx driver is required to remove the stock Picatinny mount from Surefire Scout Lights. Recommended torque: 30-inch lbs. for M-Lok screws and 20-inch lbs. for light body screws with medium strength thread locker.