This is a Magpul Industries Mount known as the Rail Light Mount, model MAG935.
The M-LOK Extended Cantilever Scout Mount provides maximum forward light positioning to minimize shadowing effects and return usable handguard space to the user. The extended cantilever design is low profile and optimized for Magpul MOE SL" Zhukov" and MOE M-LOK Shotgun forends as well as compatible aluminum M-LOK handguards.
Features:
Fits Surefire® Scout Light® and Streamlight® ProTac® Rail Lights
Mounts to M-LOK compatible systems
Recoil/impact mitigation lugs
