Eotech Holographic Weapon Sight Md: 516A651 .
Specifications:- Buttons on left side of sight (not in back) to work specifically with magnifiers - CR123 Lithium batteries; model with 65 MOA ring/1 MOA dot reticle - Raised 7mm base with knurled cross bolt - Fits to standard 1-Inch Weaver dovetail/Picatinny rail