This is a GG&G, Inc. Mount known as the Accucam QD Mount, model GGG-1269.
The Accucam QD System for the EOTech XPS Series is a scaled down version of the Accucam QD System (NSN: 1240-99-696-3341) that GG&G provides to civilian" law enforcement and military users for use with EOTech 512 and 552 optics. The patented GG&G Accucam QD Mounting System is still the only QD lever system available today that does not add height to the EOTech optics" while maintaining proper cheek weld and fast co-witnessing.
Features:
System not recommended for .50 BMG or lightweight machine guns
Manganese phosphate matte black finish
Solid billet 4140 steel