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 the ATPIAL laser/illuminator series, including the ATPIAL-C, AN/PEQ15, and LA-5/PEQ. It will also allow the light to clear the QD lever on the Steiner DBAL I2, A3, and D2.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 threadlocker.