New locking M-lok Quick Detatch 140mm Picatinny Rail. Easily attach any Picatinny Rail mounted accessory (lights lasers vertical grips etc) anywhere along the M-Lok rail. Press buttons and insert into M-Lok rail slot. Release buttons and press down to firmly seat the mount to the rail. Mount is now firmly attached to the rail. Use as normal (no tools needed). To release squeeze buttons and pull away from the rail.