This is a Midwest Industries Mount known as the Light Mount, model MCTAR-01G2.
Midwest Industries MI Tactical Light Mount is built for any circumstances and made to help the shooter adapt to any situation. It is extremely rigid and will not move once it is tightened due to the taper and angled cuts. With its two mil-spec picatinny rails with two anti-rotation sling swivel sockets" it will fit any AR series rifle with standard front sight housing.
Features:
Extremely rigid
Will not move once tightened due to taper and angled cuts
Easy install
