The Patent Pending Arisaka Inline Scout Pro Mount is designed specifically for the Surefire Scout Light Pro swivel bodies. This mount is a drop-in replacement for the OEM M-Lok mount, and allows for optimal positioning with lasers, plus can be used in a cantilever fashion off the end of the handguard for less barrel or suppressor shadow. The Patent Pending design features a triangular shape that resists twisting or bending. Compatible with the following Surefire Scout Light Pro models: M140A" M340C" M340V" M640DF" M640U" and M640V.Features : ,Length: 3.0";"Weight: 0.8 oz, ,Hardware: Two M-Lok nuts, two 10-24x3/8" hex cap head screws, Made in the USA.